# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a201370 Showing 1-1 of 1 %I A201370 #6 Dec 18 2015 18:17:55 %S A201370 2,3,8,36,268,3739,115168,8866257,1799674094,976134459840 %N A201370 Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards %C A201370 Diagonal of A201375 %e A201370 Some solutions for n=5 %e A201370 ..0..1..1..1..1....0..0..0..0..1....0..1..1..1..1....0..0..1..1..1 %e A201370 ..1..0..1..1..1....0..0..0..1..0....1..0..0..1..1....0..1..0..0..1 %e A201370 ..1..1..0..0..1....0..1..1..0..0....1..0..0..1..1....0..1..1..1..0 %e A201370 ..1..1..0..1..0....1..0..1..0..0....1..1..1..0..0....1..0..1..1..0 %e A201370 ..1..1..1..0..0....1..1..0..0..0....1..1..1..0..0....1..1..0..0..0 %K A201370 nonn %O A201370 1,1 %A A201370 _R. H. Hardin_ Nov 30 2011 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE