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A172622
Number of n X n 0..2 arrays with row sums 4 and column sums 4
1
0, 1, 21, 2371, 628080, 342829125, 344827336455, 589985590963930, 1614966163545077280, 6736902064011471514050, 41169485539316907099731250, 356683733303639928299266819050, 4261817244676586430350506540348800
OFFSET
1,3
LINKS
CROSSREFS
Sequence in context: A219000 A033510 A123844 * A172675 A068254 A144853
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved