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 A218526 #8 Jul 22 2025 23:58:49 %S A218526 1024,9858,1254462,55161270,3856183182,232640291710,15254005086276, %T A218526 976050560467866,63186522328806688,4074953804995533450, %U A218526 263247479789131189516,16998628931896126608784,1097906084227236452750416 %N A218526 Number of 5Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..3 5Xn array. %C A218526 Row 5 of A218522 %H A218526 R. H. Hardin, <a href="/A218526/b218526.txt">Table of n, a(n) for n = 1..47</a> %e A218526 Some solutions for n=3 %e A218526 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A218526 ..2..0..0....0..1..2....0..1..3....0..1..1....2..0..1....2..0..0....2..0..0 %e A218526 ..0..0..2....2..1..1....3..1..3....2..1..2....2..1..2....2..0..1....1..0..2 %e A218526 ..0..0..1....1..1..3....1..1..3....3..2..0....3..0..3....3..1..1....3..1..1 %e A218526 ..0..0..0....3..0..0....2..2..3....0..0..0....0..0..1....3..0..0....3..1..3 %K A218526 nonn %O A218526 1,1 %A A218526 _R. H. Hardin_ Oct 31 2012