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 A052373 #11 Sep 03 2018 23:06:29 %S A052373 1,1,4,10,33,91,298,910,2974,9655,32287,108274,367489,1246921,4229171, %T A052373 14246120,47542245,156588539,507914513,1618965097,5064384168, %U A052373 15531406244,46670874679,137372332583,396053582039,1118577433593 %N A052373 Number of nonnegative integer 7 X 7 matrices with sum of elements equal to n, under row and column permutations. %C A052373 a(n) = A007716(n) for n=0..7. %H A052373 Andrew Howroyd, <a href="/A052373/b052373.txt">Table of n, a(n) for n = 0..1000</a> %Y A052373 Row 7 of A318795. %Y A052373 Cf. A002724, A053307, A053304. %K A052373 nonn %O A052373 0,3 %A A052373 _Vladeta Jovovic_, Mar 08 2000