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A102713 Total sum of odd parts in all compositions of n. 0
1, 2, 8, 18, 48, 110, 260, 586, 1320, 2918, 6412, 13954, 30192, 64926, 138964, 296122, 628664, 1330134, 2805916, 5903090, 12388736, 25942542, 54215268, 113090858, 235502408 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a(n) = ((15*n+4)*2^(n-1)-2*(3*n+1)*(-1)^n)/27.

CROSSREFS

Cf. A066967, A073371.

Sequence in context: A073307 A064009 A201348 * A114723 A153335 A119853

Adjacent sequences:  A102710 A102711 A102712 * A102714 A102715 A102716

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 06 2005

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Last modified February 16 01:31 EST 2012. Contains 205860 sequences.