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A081124 Binomial transform of floor(n/2)!. 3
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; refs; listen; history; internal format)
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 * A090901 A101516 A118928

Adjacent sequences:  A081121 A081122 A081123 * A081125 A081126 A081127

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 07 2003

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Last modified February 16 16:51 EST 2012. Contains 205938 sequences.