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 A201275 #16 Mar 18 2024 12:33:38 %S A201275 1,1,9,41,143,442,1260,3113,7331,15969,32737,63942,120318,216392, %T A201275 377902,640970,1055829,1699241,2679576,4132842,6267048,9345121, %U A201275 13712218,19841970,28343579,39963063,55722233,76873873,104958237,141966994,190366323,253040267,333758897 %N A201275 Number of n X 6 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %H A201275 Alois P. Heinz, <a href="/A201275/b201275.txt">Table of n, a(n) for n = 0..200</a> (terms n = 1..101 from R. H. Hardin) %e A201275 Some solutions for n=5: %e A201275 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 %e A201275 0 0 1 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 %e A201275 0 1 1 1 2 2 0 0 1 1 1 1 0 1 1 1 1 2 0 1 1 1 1 2 %e A201275 0 1 1 1 2 2 0 2 2 2 2 2 1 1 1 2 2 2 0 1 2 2 2 2 %e A201275 2 2 2 2 2 2 0 2 2 2 2 2 2 2 2 2 2 2 0 2 2 2 2 2 %Y A201275 Column 6 of A201277. %K A201275 nonn %O A201275 0,3 %A A201275 _R. H. Hardin_, Nov 29 2011 %E A201275 a(0)=1 prepended by _Alois P. Heinz_, Mar 18 2024