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