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 A219888 #5 Jul 23 2025 00:46:21 %S A219888 36,247,2701,40239,565824,8017398,113313853,1558416287 %N A219888 Number of 7Xn arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 7Xn array. %C A219888 Row 7 of A219883 %e A219888 Some solutions for n=3 %e A219888 ..0..0..0....0..0..0....0..0..0....0..0..0....1..0..0....1..1..1....1..0..0 %e A219888 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....1..1..1....1..0..0 %e A219888 ..1..1..1....1..1..1....1..0..0....1..1..1....0..0..0....1..1..1....1..0..1 %e A219888 ..1..1..1....1..1..2....0..0..0....0..0..0....0..1..0....1..0..1....2..1..1 %e A219888 ..1..1..2....1..0..1....0..0..0....0..0..0....1..1..1....1..0..0....2..1..1 %e A219888 ..1..1..1....1..0..0....0..1..0....0..0..0....1..1..1....2..0..1....2..1..1 %e A219888 ..1..1..1....1..0..1....2..1..2....1..0..0....2..1..2....2..1..1....2..1..1 %K A219888 nonn %O A219888 1,1 %A A219888 _R. H. Hardin_ Nov 30 2012