A172723 Number of n X n 0..3 arrays with row sums 4 and column sums 4

0, 3, 87, 8515, 1992760, 971853075, 887226868605, 1397573379100570, 3564687080800036800, 13994422270858878448950, 81142871841524279822631750, 671520101271652710399345719850, 7707138964962257026620598104320400

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n=1..55

Crossrefs

Sequence in context: A368620 A230670 A232069 * A331645 A037112 A093748

Adjacent sequences: A172720 A172721 A172722 * A172724 A172725 A172726

Keyword

nonn

Author

R. H. Hardin Feb 06 2010

Status

approved