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A046672 G.f.: 1/(1-2*x-3*x^2+2*x^3). 2
1, 2, 7, 18, 53, 146, 415, 1162, 3277, 9210, 25927, 72930, 205221, 577378, 1624559, 4570810, 12860541, 36184394, 101808791, 286449682, 805956949, 2267645362, 6380262207, 17951546602, 50508589101, 142111293594, 399845261287, 1125007225154 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..27.

Index entries for linear recurrences with constant coefficients, signature (2,3,-2).

CROSSREFS

Partial sums of A054854.

Cf. A101197.

Sequence in context: A006869 A099626 A261331 * A046866 A214836 A176813

Adjacent sequences:  A046669 A046670 A046671 * A046673 A046674 A046675

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Nov 17 2002

STATUS

approved

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Last modified July 23 05:58 EDT 2017. Contains 289686 sequences.