This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A185426 #7 Jul 22 2025 09:45:55 %S A185426 6842284,21536560306,84722449466168,378372621022753476, %T A185426 1812817799965228636502,9008824580891342846197566, %U A185426 45497009931939204350899288292 %N A185426 Number of (n+2)X(n+2) 0..7 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order. %C A185426 Diagonal of A185435 %e A185426 Some solutions for 4X4 %e A185426 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0 %e A185426 ..0..0..0..4....0..0..0..0....0..0..0..0....0..0..0..4....0..0..0..4 %e A185426 ..0..1..5..2....0..1..4..6....0..0..0..2....0..0..7..3....0..0..6..6 %e A185426 ..0..3..7..5....0..2..7..1....2..4..6..5....0..5..4..5....0..7..2..0 %K A185426 nonn %O A185426 1,1 %A A185426 _R. H. Hardin_ Jan 27 2011