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 A201381 #7 Jul 22 2025 16:12:48 %S A201381 2,9,115,483,7148,24779,295813,804538,7711613,17135660,137991357, %T A201381 261853930,1838296465,3078156753,19352193027,29273561002,168059197372, %U A201381 233637796573,1242746736360,1608517392555,8015798428649,9756858004272 %N A201381 Number of nX5 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other. %C A201381 Column 5 of A201384 %H A201381 R. H. Hardin, <a href="/A201381/b201381.txt">Table of n, a(n) for n = 1..180</a> %e A201381 Some solutions for n=6 %e A201381 ..0..0..0..1..1....0..0..0..1..1....0..0..0..0..1....0..0..0..1..1 %e A201381 ..0..0..1..0..0....0..0..1..0..1....0..0..1..1..1....0..0..1..0..0 %e A201381 ..0..0..1..0..1....0..1..0..1..0....0..1..0..0..1....0..0..1..0..1 %e A201381 ..0..1..1..1..1....0..1..1..1..1....1..1..0..0..0....0..1..1..1..1 %e A201381 ..1..0..1..0..1....1..0..1..0..0....1..1..0..1..0....1..0..0..0..0 %e A201381 ..1..1..0..1..0....1..1..1..0..0....1..1..0..1..1....1..1..1..1..1 %K A201381 nonn %O A201381 1,1 %A A201381 _R. H. Hardin_ Nov 30 2011