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 A186178 #7 Jul 22 2025 10:18:32 %S A186178 1078197169699,159099595031390,12251749347425002,629512200937395977, %T A186178 23974440869491730184,719176668433423037034,17695100284866122677270, %U A186178 367664080675457084952938,6594122451689240367926243 %N A186178 Number of (n+2)X9 0..5 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order. %C A186178 Column 7 of A186180 %H A186178 R. H. Hardin, <a href="/A186178/b186178.txt">Table of n, a(n) for n = 1..39</a> %e A186178 Some solutions for 4X9 %e A186178 ..0..0..0..0..0..0..0..0..3....0..0..0..0..0..0..0..0..0 %e A186178 ..0..0..0..0..0..0..0..1..4....0..0..0..0..0..0..0..0..2 %e A186178 ..0..0..0..0..0..0..0..2..3....0..0..0..0..0..0..0..0..5 %e A186178 ..0..0..0..0..0..0..3..5..5....0..0..0..0..0..0..0..5..5 %K A186178 nonn %O A186178 1,1 %A A186178 _R. H. Hardin_ Feb 13 2011