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 A218821 #5 Jul 23 2025 00:06:08 %S A218821 21,1049,29593,720305,18519049,468783431,11931365309,303182474797 %N A218821 Unmatched value maps: number of nX6 binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..2 nX6 array. %C A218821 Column 6 of A218823 %e A218821 Some solutions for n=3 %e A218821 ..1..0..0..0..0..1....1..1..0..0..1..0....0..0..0..1..0..0....0..1..0..1..0..1 %e A218821 ..0..0..0..1..0..0....0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..1..0..0 %e A218821 ..0..0..0..1..0..1....0..1..1..1..0..0....0..0..0..1..1..0....1..0..1..0..1..0 %K A218821 nonn %O A218821 1,1 %A A218821 _R. H. Hardin_ Nov 06 2012