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%I A223652 #4 Mar 25 2013 07:30:34
%S A223652 3,9,5,9,25,13,35,43,169,27,77,229,343,729,60,207,799,5751,1973,3600,
%T A223652 119,513,3237,40981,78213,10425,14161,251,1415,16975,427313,1044311,
%U A223652 1059839,64669,63001,477,4009,58813,4854187,22982345,24559913,13505813,347013
%N A223652 T(n,k)=Number of (n+2)Xk 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
%C A223652 Table starts
%C A223652 ....3........9.........9...........35............77............207
%C A223652 ....5.......25........43..........229...........799...........3237
%C A223652 ...13......169.......343.........5751.........40981.........427313
%C A223652 ...27......729......1973........78213.......1044311.......22982345
%C A223652 ...60.....3600.....10425......1059839......24559913.....1119629805
%C A223652 ..119....14161.....64669.....13505813.....569451603....50246141433
%C A223652 ..251....63001....347013....172509399...13134713511..2434395476789
%C A223652 ..477...227529...1639675...1684095249..219299436501.75307144658325
%C A223652 .1001..1002001...8731185..20632590041.4713184697381
%C A223652 .2011..4044121..47326725.242227127509
%C A223652 .4034.16273156.233731602
%C A223652 .7901.62425801
%H A223652 R. H. Hardin, <a href="/A223652/b223652.txt">Table of n, a(n) for n = 1..96</a>
%e A223652 Some solutions for n=3 k=4
%e A223652 ..1..1..0..1....1..1..1..1....1..1..0..1....0..0..0..1....1..1..0..1
%e A223652 ..0..0..0..0....1..1..1..1....0..0..1..1....0..0..0..0....1..0..1..1
%e A223652 ..0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0
%e A223652 ..1..1..1..1....0..0..0..0....0..0..0..0....1..1..0..1....0..1..0..1
%e A223652 ..0..0..1..1....0..0..1..1....1..1..1..1....1..1..1..1....1..1..1..1
%K A223652 nonn,tabl
%O A223652 1,1
%A A223652 _R. H. Hardin_ Mar 25 2013

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