id:A103321 - OEIS Search Results

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

+0
1

1, 2, 4, 9, 18, 35, 68, 130, 246, 463, 867, 1617, 3007, 5579, 10332, 19107, 35295, 65140, 120137, 221444, 407999, 751453, 1383641, 2547116, 4688106, 8627504, 15875390, 29209560, 53739655, 98864470, 181872110, 334561861, 615423932 (list; graph; listen)

	OFFSET	`0,2`
	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+4) - A000930(n+2) = Sum[k=0..n, A000073(k+2)*A000930(n-k) ].`
	CROSSREFS	`Sequence in context: A046683 A065055 A065030 this_sequence A138196 A101351 A111662` `Adjacent sequences: A103318 A103319 A103320 this_sequence A103322 A103323 A103324`
	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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