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 A220151 #6 Jul 23 2025 00:53:41 %S A220151 21,137,1413,16110,214767,3057777,42648602,564936966,7083618786, %T A220151 84318189822,956390845855,10375891940786,108038550060777, %U A220151 1082857046843897,10473029871107227,97945268899475975,887304577889584770 %N A220151 Number of nX6 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX6 array. %C A220151 Column 6 of A220153 %H A220151 R. H. Hardin, <a href="/A220151/b220151.txt">Table of n, a(n) for n = 1..27</a> %e A220151 Some solutions for n=3 %e A220151 ..1..0..0..0..0..0....2..1..0..0..0..0....2..1..0..0..0..0....1..0..0..0..0..0 %e A220151 ..1..1..1..0..0..0....2..2..2..1..0..0....2..1..1..1..0..0....1..1..0..0..0..0 %e A220151 ..2..2..1..1..0..0....2..2..2..2..1..1....2..1..1..1..2..1....2..1..1..1..0..0 %K A220151 nonn %O A220151 1,1 %A A220151 _R. H. Hardin_ Dec 06 2012