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 A201698 #7 Jul 22 2025 16:19:12 %S A201698 3,48,2068,167625,14268351,795339012,27102769900,615440785548, %T A201698 10106227864338,127441635892627,1290114077123683,10846768837607450, %U A201698 77797729805055016,486398599750167133,2697872438447793007 %N A201698 Number of nX6 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards. %C A201698 Column 6 of A201700 %H A201698 R. H. Hardin, <a href="/A201698/b201698.txt">Table of n, a(n) for n = 1..90</a> %F A201698 Empirical: a(n) is a polynomial of degree 34 %e A201698 Some solutions for n=3 %e A201698 ..0..1..1..2..2..2....1..1..2..2..2..2....0..1..1..1..1..2....0..1..1..1..2..2 %e A201698 ..2..0..1..0..2..2....2..2..1..1..2..2....1..1..1..1..2..0....2..0..2..2..0..0 %e A201698 ..2..2..1..1..0..0....2..2..2..2..1..1....2..1..1..1..0..0....2..2..0..0..0..0 %K A201698 nonn %O A201698 1,1 %A A201698 _R. H. Hardin_ Dec 03 2011