A223646 - OEIS

A223646

Number of (n+2)X2 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

9, 25, 169, 729, 3600, 14161, 63001, 227529, 1002001, 4044121, 16273156, 62425801, 265755204, 1044840976, 4209284641, 16964020516, 67776915600, 271492060401, 1096068706489, 4316558882689, 17448715791556, 70160140107225

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OFFSET

1,1

COMMENTS

Column 2 of A223652

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..45

EXAMPLE

Some solutions for n=3

..1..1....1..0....1..1....1..1....1..1....1..0....1..1....1..0....1..1....1..1

..1..0....0..1....1..0....0..0....0..0....0..0....0..0....0..0....0..0....1..0

..1..0....0..0....0..1....0..0....0..1....1..0....0..0....0..0....1..0....0..1