A172622 Number of n X n 0..2 arrays with row sums 4 and column sums 4

0, 1, 21, 2371, 628080, 342829125, 344827336455, 589985590963930, 1614966163545077280, 6736902064011471514050, 41169485539316907099731250, 356683733303639928299266819050, 4261817244676586430350506540348800

Offset

1,3

Links

R. H. Hardin, Table of n, a(n) for n=1..56

Crossrefs

Sequence in context: A219000 A033510 A123844 * A172675 A068254 A144853

Adjacent sequences: A172619 A172620 A172621 * A172623 A172624 A172625

Keyword

nonn

Author

R. H. Hardin Feb 06 2010

Status

approved