id:A122648 - OEIS Search Results

Search: id:A122648

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E.g.f.: exp(x^2)*(exp(2*x)+1)/2.

+0
1

1, 1, 4, 10, 44, 156, 752, 3256, 17040, 84496, 475712, 2611104, 15687872, 93376960, 594638592, 3786534784, 25412227328, 171474649344, 1206965027840, 8569374206464, 63003419470848, 468111364627456, 3582366347030528, 27733474149611520, 220255800262627328 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`C.-O. Chow, Counting involutory, unimodal and alternating signed permutations, Discr. Math. 306 (2006), 2222-2228.`
	CROSSREFS	`Sequence in context: A149223 A149224 A149225 this_sequence A058819 A052394 A066229` `Adjacent sequences: A122645 A122646 A122647 this_sequence A122649 A122650 A122651`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 22 2006`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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