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 A218649 #6 Jul 23 2025 00:02:41 %S A218649 236,5644,391888,23370578,1519211492,99181510254,6431987350130, %T A218649 419623464236488,27357863689722514,1783200625332610748, %U A218649 116285423303246786898,7582253123955997499522,494404195464186732399198 %N A218649 Number of nX6 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..3 nX6 array. %C A218649 Column 6 of A218651 %H A218649 R. H. Hardin, <a href="/A218649/b218649.txt">Table of n, a(n) for n = 1..127</a> %e A218649 Some solutions for n=3 %e A218649 ..0..0..0..1..0..0....0..0..2..3..2..1....0..0..0..0..0..2....0..0..0..1..1..0 %e A218649 ..0..0..1..0..0..0....0..1..1..1..0..0....0..1..0..0..1..3....0..0..1..3..0..0 %e A218649 ..1..2..0..0..0..1....1..1..1..0..0..0....2..3..1..1..1..3....0..1..2..1..0..0 %K A218649 nonn %O A218649 1,1 %A A218649 _R. H. Hardin_ Nov 03 2012