A172718 - OEIS

%I #4 Mar 31 2012 12:35:41

%S 1,44152809,12331175198408791725,1237527402223677679598899948925700,

%T 10500268455366221173591541192738752806765261187500,

%U 3138480844349933121860864061245246387668619696538799391771830312500

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

%H R. H. Hardin, <a href="/A172718/b172718.txt">Table of n, a(n) for n=1..10</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 06 2010