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A140722
Number of n X n symmetric matrices with nonnegative integer entries with each row sum i equal to i (1..n).
0
1, 2, 8, 61, 957, 31520, 2199080, 328002710, 105370907181
OFFSET
1,2
CROSSREFS
Sequence in context: A005215 A058862 A191482 * A327078 A332779 A116976
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2008
STATUS
approved