A172667 - OEIS

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

%S 0,0,1680,1252634243520,15966070888767791932191,

%T 2333327772435239191435579651896000,

%U 2927463235524353975393755326111103021707295200

%N Number of 3*n X n 0..2 arrays with row sums 5 and column sums 15

%H R. H. Hardin, <a href="/A172667/b172667.txt">Table of n, a(n) for n=1..14</a>

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 06 2010