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 A219886 #5 Jul 23 2025 00:46:09 %S A219886 21,87,410,2645,14536,74998,371384,1780796,8327951,37770000,165587776, %T A219886 701557921,2877746302,11458190975,44395384830,167697083241, %U A219886 618401792448,2228478398270,7854147511367 %N A219886 Number of 5Xn arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 5Xn array. %C A219886 Row 5 of A219883 %e A219886 Some solutions for n=3 %e A219886 ..0..0..0....2..0..0....1..1..1....1..1..1....0..0..0....0..0..0....0..0..0 %e A219886 ..0..0..0....2..0..0....1..1..1....1..1..1....0..0..0....0..0..0....0..0..0 %e A219886 ..1..0..1....2..0..0....0..0..0....1..0..1....0..0..0....0..0..0....1..0..0 %e A219886 ..1..2..1....2..0..1....0..0..0....1..0..0....0..0..0....0..1..0....1..0..1 %e A219886 ..2..2..2....2..1..2....0..0..0....1..0..0....2..1..2....1..2..1....2..0..0 %K A219886 nonn %O A219886 1,1 %A A219886 _R. H. Hardin_ Nov 30 2012