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A172645 Number of n X n 0..2 arrays with row sums n and column sums n 1
1, 3, 31, 2371, 1084851, 3680774301, 91358224634433, 17470072106054582211, 26088526624958727703324771, 310419652143758898175543447421953, 29785621316391113552729016416250323294253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n=1..14

CROSSREFS

Sequence in context: A144906 A081789 A066976 * A201604 A048562 A022499

Adjacent sequences:  A172642 A172643 A172644 * A172646 A172647 A172648

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified June 20 19:36 EDT 2019. Contains 324234 sequences. (Running on oeis4.)