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 A219477 #5 Jul 23 2025 00:30:41 %S A219477 120,3259,982456,208345624,37552353044,5432184254977,664221777830589 %N A219477 Number of 7Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 7Xn array. %C A219477 Row 7 of A219471 %e A219477 Some solutions for n=3 %e A219477 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A219477 ..0..0..2....0..0..0....0..0..0....0..0..2....0..0..2....0..0..2....0..0..0 %e A219477 ..0..0..2....1..0..2....0..0..0....2..1..1....0..0..1....0..0..0....0..0..1 %e A219477 ..2..0..0....2..2..3....1..0..0....1..1..1....1..1..2....0..0..0....0..0..0 %e A219477 ..0..0..0....2..2..1....1..0..0....1..1..1....2..2..3....0..0..3....0..0..3 %e A219477 ..0..0..0....1..1..1....2..0..1....1..1..1....3..1..1....2..1..1....0..0..3 %e A219477 ..0..3..3....1..3..3....3..1..1....1..2..3....3..1..2....2..0..0....1..1..2 %K A219477 nonn %O A219477 1,1 %A A219477 _R. H. Hardin_ Nov 20 2012