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A183188 a(n) = 3*a(n-1) + a(n-3) with a(0)=1, a(1)=2, a(2)=6. 1
1, 2, 6, 19, 59, 183, 568, 1763, 5472, 16984, 52715, 163617, 507835, 1576220, 4892277, 15184666, 47130218, 146282931, 454033459, 1409230595, 4373974716, 13575957607, 42137103416, 130785284964, 405931812499, 1259932540913, 3910582907703, 12137680535608 (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 (3,0,1).

FORMULA

G.f.: ((1-x)/(1-3*x-x^3).

a(n) = A052541(n)-A051541(n-1). - R. J. Mathar, Dec 15 2011

CROSSREFS

Cf. A193723

Sequence in context: A037512 A111277 A014346 * A118364 A208481 A052544

Adjacent sequences:  A183185 A183186 A183187 * A183189 A183190 A183191

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Dec 14 2011

EXTENSIONS

Corrected by R. J. Mathar, Dec 15 2011

STATUS

approved

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Last modified August 18 23:43 EDT 2017. Contains 290782 sequences.