A172566 - OEIS

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

%S 0,0,0,0,0,1,182509367040000,712008996110160366168717566400,

%T 7664603814657718197913972357390335773198400000,

%U 299436894513044390420517533660659195248061275496427347927110000

%N Number of 3*n X n 0..1 arrays with row sums 6 and column sums 18

%H R. H. Hardin, <a href="/A172566/b172566.txt">Table of n, a(n) for n=1..12</a>

%K nonn

%O 1,7

%A _R. H. Hardin_ Feb 06 2010