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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 27 06:49 EST 2021. Contains 349365 sequences. (Running on oeis4.)