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 A200986 #7 Jul 28 2022 20:54:03 %S A200986 5,79,537,1225,1095,15023,95845,268375,325061,168262,1743684,7499861, %T A200986 15130265,14517651,5800482,49981930,178151444,307672792,257468817, %U A200986 87287958,681245186,2178690191,3396865595,2581813804,796596745 %N A200986 Number of n X 4 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 A200986 Column 4 of A200990. %H A200986 R. H. Hardin, <a href="/A200986/b200986.txt">Table of n, a(n) for n = 1..52</a> %e A200986 Some solutions for n=3 %e A200986 ..0..1..1..3....0..1..2..3....0..1..2..3....0..1..2..3....0..1..1..2 %e A200986 ..0..2..2..3....0..1..2..3....0..1..2..4....0..1..2..3....0..1..3..3 %e A200986 ..0..2..4..4....3..4..4..4....0..3..4..4....0..4..4..4....2..4..4..4 %Y A200986 Cf. A200990. %K A200986 nonn %O A200986 1,1 %A A200986 _R. H. Hardin_, Nov 25 2011