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A136299 a(n)=3a(n-1)-4a(n-3), n>3. 1
1, 2, 4, 7, 13, 23, 41, 71, 121, 199, 313, 455, 569, 455, -455, -3641, -12743, -36409, -94663, -233017, -553415, -1281593, -2912711, -6524473, -14447047, -31690297, -68972999, -149130809, -320631239, -686001721, -1461481927, -3101920825, -6561755591, -13839339065 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

O.g.f.: -(-1+x+2*x^2+x^3)/[(1+x)(-1+2*x)^2]. a(n)=11*2^n/9+(-1)^n/9-A001787(n+1)/12 if n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008

CROSSREFS

Cf. A051013.

Sequence in context: A128609 A168043 A114832 * A003116 A165648 A078038

Adjacent sequences:  A136296 A136297 A136298 * A136300 A136301 A136302

KEYWORD

sign,easy

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Mar 22 2008

EXTENSIONS

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008

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Last modified February 15 17:46 EST 2012. Contains 205835 sequences.