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 A200985 #7 Jul 22 2025 16:02:53 %S A200985 10,20,92,537,140,3157,3604,6692,26168,5408,84188,69613,118244,371475, %T A200985 57479,864418,645309,916025,2639447,387005,5166751,3514237,4833175, %U A200985 12896465,1709869,22408038,14621090,18653741,47941297,6213321,76880715 %N A200985 Number of nX3 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 A200985 Column 3 of A200990 %H A200985 R. H. Hardin, <a href="/A200985/b200985.txt">Table of n, a(n) for n = 1..103</a> %e A200985 Some solutions for n=4 %e A200985 ..0..1..1....0..2..2....0..0..2....0..0..2....0..0..0....0..0..2....0..0..2 %e A200985 ..0..2..2....0..2..3....1..1..4....1..2..3....1..1..2....1..2..4....0..1..2 %e A200985 ..1..2..4....1..3..4....1..2..4....1..3..3....2..3..4....1..3..4....1..1..3 %e A200985 ..3..3..4....1..3..4....3..3..4....4..4..4....3..4..4....1..3..4....3..4..4 %K A200985 nonn %O A200985 1,1 %A A200985 _R. H. Hardin_ Nov 25 2011