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 A219008 #5 Jul 23 2025 00:10:51 %S A219008 1,5854,973492,95431043,10745153084 %N A219008 Unmatched value maps: number of 7Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal, diagonal or antidiagonal neighbor in a random 0..2 7Xn array. %C A219008 Row 7 of A219002 %e A219008 Some solutions for n=3 %e A219008 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A219008 ..0..0..0....0..0..1....1..0..0....0..1..1....0..0..0....0..1..0....0..1..1 %e A219008 ..0..1..1....1..1..0....0..1..1....0..0..0....0..0..1....1..0..1....1..0..0 %e A219008 ..1..0..0....0..1..0....1..0..1....1..1..1....0..0..0....0..0..0....1..0..1 %e A219008 ..1..1..0....1..0..1....0..1..0....0..1..0....1..0..0....0..1..0....0..1..1 %e A219008 ..0..0..1....1..1..0....1..0..0....1..0..1....0..0..1....0..0..1....1..1..0 %e A219008 ..1..1..1....1..0..1....0..0..1....1..1..0....0..1..0....1..0..0....0..0..1 %K A219008 nonn %O A219008 1,2 %A A219008 _R. H. Hardin_ Nov 09 2012