id:A103322 - OEIS Search Results

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Expansion of 1 / [(1-x-x^2-x^3)(1-x^2-x^3)].

+0
1

1, 1, 3, 6, 11, 22, 41, 77, 144, 267, 495, 915, 1689, 3115, 5740, 10572, 19464, 35825, 65926, 121301, 223166, 410544, 755211, 1389186, 2555292, 4700154, 8645248, 15901510, 29247993, 53796183, 98947583, 181994272, 334741367, 615687632 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`A. T. Benjamin and J. J. Quinn, Proofs that really count: the art of combinatorial proof, M.A.A. 2003, p. 47, ex. 4.`
	FORMULA	`a(n) = A000073(n+3) - A000930(n+4) = Sum[k=0..n, A000073(k+2)*A000930(n-k+3) ].`
	CROSSREFS	`Sequence in context: A104253 A115030 A018177 this_sequence A117075 A024506 A068033` `Adjacent sequences: A103319 A103320 A103321 this_sequence A103323 A103324 A103325`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Feb 02 2005`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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