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 A212935 #6 Jul 22 2025 22:59:34 %S A212935 1,4095,386357608,279128913678335,916111390974365234376, %T A212935 10046278068363977051128904352,300496032699305814168049256913886664, %U A212935 21222664979041855752064468032655567100514303 %N A212935 Number of 6Xn 0..n-1 arrays with no column j greater than column j-1 in all rows. %C A212935 Row 6 of A212930 %H A212935 R. H. Hardin, <a href="/A212935/b212935.txt">Table of n, a(n) for n = 1..15</a> %e A212935 Some solutions for n=3 %e A212935 ..2..0..0....2..2..1....1..0..1....1..0..2....1..1..2....2..2..0....1..0..0 %e A212935 ..0..2..0....2..1..1....2..0..2....1..2..1....0..0..1....0..0..2....1..2..2 %e A212935 ..0..1..1....1..2..1....1..0..2....2..2..1....2..2..2....2..0..0....0..0..0 %e A212935 ..1..0..1....1..1..1....0..1..0....2..0..2....1..2..1....1..0..1....2..0..2 %e A212935 ..2..2..1....1..0..1....0..0..2....2..2..0....0..2..2....1..2..2....2..0..1 %e A212935 ..0..1..1....2..1..2....1..0..0....0..2..1....0..0..2....2..1..2....0..0..0 %K A212935 nonn %O A212935 1,2 %A A212935 _R. H. Hardin_ May 31 2012