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 A172639 #6 Jul 22 2025 07:35:20 %S A172639 1,51,991,32611,1084851,39612501,1509893001,59794281891,2435292751411, %T A172639 101471705778601,4307041366439901,185658731463324901, %U A172639 8107975032968711941,358060848206529563811,15966070888767791932191,717973394997481520889891 %N A172639 Number of n X 5 0..2 arrays with row sums 5 and column sums n. %H A172639 R. H. Hardin, <a href="/A172639/b172639.txt">Table of n, a(n) for n=1..99</a> %K A172639 nonn %O A172639 1,2 %A A172639 _R. H. Hardin_ Feb 06 2010