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 A200989 #6 Jul 22 2025 16:03:13 %S A200989 10,157,3604,95845,97341,8434277,29555346,171588826,1801771085, %T A200989 853004113,35516752065,68635361025,249178222379,1665476375295, %U A200989 526294467301,15773537280426,22528310745889 %N A200989 Number of nX7 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %C A200989 Column 7 of A200990 %e A200989 Some solutions for n=3 %e A200989 ..0..0..0..0..2..2..4....0..0..0..2..2..2..4....0..0..1..1..2..3..3 %e A200989 ..0..1..1..2..3..3..4....0..1..1..2..2..3..4....0..1..1..1..3..4..4 %e A200989 ..1..1..2..3..3..4..4....1..1..3..3..3..4..4....0..2..2..2..3..4..4 %K A200989 nonn %O A200989 1,1 %A A200989 _R. H. Hardin_ Nov 25 2011