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A067212 Number of n X n 0..4 matrices with all row and column sums equal.

%I A067212 #20 Oct 14 2024 11:24:53
%S A067212 1,5,25,1001,790425,11991502235,3632894572698505,
%T A067212 22823286475857170293275,3059096488092534208632573065881,
%U A067212 8933959513305390145234950731901862541009,577809775169956916510410207413319463664222819419555
%N A067212 Number of n X n 0..4 matrices with all row and column sums equal.
%e A067212 Some solutions for n=3
%e A067212 ..4..4..3....2..1..1....2..1..1....4..0..4....1..2..4....3..2..2....3..2..1
%e A067212 ..4..3..4....1..3..0....2..0..2....0..4..4....2..3..2....2..1..4....0..3..3
%e A067212 ..3..4..4....1..0..3....0..3..1....4..4..0....4..2..1....2..4..1....3..1..2
%Y A067212 Column k=4 of A202784.
%K A067212 nonn
%O A067212 0,2
%A A067212 _R. H. Hardin_, Feb 20 2002
%E A067212 Added one term and example - _R. H. Hardin_, Jan 05 2012
%E A067212 a(7)-a(8) from _Andrew Howroyd_, Jun 01 2017
%E A067212 a(9)-a(10) from _Sean A. Irvine_, Dec 14 2023
%E A067212 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024