id:A000137 - OEIS Search Results

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Series-parallel numbers.
(Formerly M1625 N0636)

+0
2

1, 2, 6, 18, 58, 186, 614, 2034, 6818, 22970, 77858, 264970, 905294, 3102434, 10661370, 36722642, 126752218, 438294018, 1518032598, 5265341314, 18286911130, 63586988434, 221342104842, 771235606050, 2689688538646, 9388096331642 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.`
	FORMULA	`G.f.: (1+S)/(1-S), where S = g.f. for A000084.`
	CROSSREFS	`Cf. A036654, A036655, A058756, A000084.` `Adjacent sequences: A000134 A000135 A000136 this_sequence A000138 A000139 A000140` `Sequence in context: A148458 A148459 A081057 this_sequence A151282 A157004 A085139`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified July 4 09:27 EDT 2009. Contains 160562 sequences.

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