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 A219497 #7 Jul 23 2025 00:30:48 %S A219497 2,3,11,35,107,325,995,3083,9663,30581,97541 %N A219497 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X n array. %C A219497 Diagonal of A219502 %e A219497 Some solutions for n=3 %e A219497 ..0..0..0....0..0..0....1..1..1....0..0..0....0..0..0....1..0..0....1..0..0 %e A219497 ..0..0..0....1..0..0....1..1..1....0..0..0....1..0..0....1..0..0....1..1..0 %e A219497 ..1..0..0....1..1..1....1..1..1....1..1..0....1..0..0....1..0..0....1..1..1 %K A219497 nonn %O A219497 1,1 %A A219497 _R. H. Hardin_ Nov 20 2012