A172893 - OEIS

%I #6 Mar 15 2023 11:14:59

%S 0,4,811,1624984,17046289085,747054974484580,114730784954807798280,

%T 53679014250694594378460480,68263787608482538080643047338467,

%U 214735064836225772744899504151062116600

%N Number of n X n 0..6 arrays with row sums 9 and column sums 9.

%H R. H. Hardin, <a href="/A172893/b172893.txt">Table of n, a(n) for n=1..15</a>

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 06 2010