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A027327 a(n) = Sum{(k+1)*T(n,m-k)}, 0<=k<=m, where m=0 for n=0,1; m=n for n >= 2; T given by A026120. 2
1, 3, 12, 36, 108, 324, 972, 2916, 8748, 26244, 78732, 236196, 708588, 2125764, 6377292, 19131876, 57395628, 172186884, 516560652, 1549681956, 4649045868, 13947137604, 41841412812, 125524238436, 376572715308 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..24.

FORMULA

G.f.: (1+3x^2)/(1-3x) - Paul Barry, May 19 2003

a(n)=A003946(n), n>1. [From R. J. Mathar, Oct 23 2008]

CROSSREFS

Sequence in context: A242526 A167667 A215919 * A167993 A061130 A247008

Adjacent sequences:  A027324 A027325 A027326 * A027328 A027329 A027330

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 26 05:25 EDT 2017. Contains 287077 sequences.