id:A081124 - OEIS Search Results

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Binomial transform of floor(n/2)!.

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4

1, 2, 4, 8, 17, 38, 90, 224, 585, 1594, 4520, 13288, 40409, 126782, 409646, 1360512, 4637681, 16202034, 57941164, 211860488, 791272129, 3015807254, 11719800674, 46401584096, 187039192185, 767058993386, 3198568491792, 13553864902504 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = Sum{k=0..n, C(n, k)floor(k/2)! }` `E.g.f.: exp(x)(1+sqrt(Pi)/2(x+2)exp(x^2/4)*erf(x/2)). - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 25 2003`
	CROSSREFS	`Cf. A081123, A004526.` `Cf. A084261.` `Sequence in context: A006461 A003007 A086615 this_sequence A090901 A101516 A118928` `Adjacent sequences: A081121 A081122 A081123 this_sequence A081125 A081126 A081127`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 07 2003`

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

AT&T Labs Research