id:A049088 - OEIS Search Results

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Number of n X n matrices with nonnegative integer entries and every row and column sum <= 2.

+0
5

1, 3, 26, 451, 12951, 551681, 32512618, 2525962461, 249675308081, 30551602194811, 4528860725614746, 799069823975939363, 165374947602000265231, 39654053930039468491521, 10900817711883556591556906, 3404265715022353551494548021, 1198175785461867097633422235713 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.65(b).`
	FORMULA	`Stanley gives an explicit generating function.`
	CROSSREFS	`Cf. A073178, A073179.` `Sequence in context: A136046 A143155 A122949 this_sequence A089041 A059511 A112676` `Adjacent sequences: A049085 A049086 A049087 this_sequence A049089 A049090 A049091`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 23 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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