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 A218835 #7 Jul 23 2025 00:06:32 %S A218835 1,7,93,3617,346501,91513161,64756459689,123101061283146, %T A218835 628132409842549671,8578834074345612228891,313263194520552901427408971 %N A218835 Unmatched value maps: number of n X n binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 n X n array. %C A218835 Diagonal of A218842 %e A218835 Some solutions for n=3 %e A218835 ..1..0..0....1..1..0....0..0..0....1..1..0....1..0..0....0..0..0....0..0..0 %e A218835 ..0..0..1....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....0..1..1 %e A218835 ..1..1..1....1..1..1....1..1..1....0..1..1....1..0..1....1..0..1....1..1..1 %K A218835 nonn %O A218835 1,2 %A A218835 _R. H. Hardin_ Nov 07 2012