A172614 - OEIS

%I #4 Mar 31 2012 12:35:40

%S 0,1,227873431500,30862498453931119524941700,

%T 303467065300162961503136931771371140440000,

%U 98744132720453916340813668495424059077053759331765698612500

%N Number of 9*n X n 0..1 arrays with row sums 2 and column sums 18

%H R. H. Hardin, <a href="/A172614/b172614.txt">Table of n, a(n) for n=1..10</a>

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 06 2010