A140722 - OEIS

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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).

1, 2, 8, 61, 957, 31520, 2199080, 328002710, 105370907181 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A005215 A058862 A191482 * A116976 A132574 A086903` `Adjacent sequences: A140719 A140720 A140721 * A140723 A140724 A140725`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net), Jul 12 2008`

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Last modified February 14 20:13 EST 2012. Contains 205663 sequences.