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A159036 a(0)=0, a(1)=1, a(2)=4, a(3)=13; thereafter a(n+3)=4*a(n+2)-4*a(n+1)+2*a(n) for n>=1. 1
0, 1, 4, 13, 38, 108, 306, 868, 2464, 6996, 19864, 56400, 160136, 454672, 1290944, 3665360, 10407008, 29548480, 83896608, 238206528, 676336640, 1920313664, 5452321152, 15480703232, 43954155648, 124798451968, 354338591744, 1006068870400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (4,-4,2).

FORMULA

G.f.: f(z)=((z+z^3)/(1-4*z+4*z^2-2*z^3))

CROSSREFS

Sequence in context: A094706 A056014 A247287 * A058693 A027076 A183112

Adjacent sequences:  A159033 A159034 A159035 * A159037 A159038 A159039

KEYWORD

easy,nonn

AUTHOR

Richard Choulet, Apr 03 2009

EXTENSIONS

Definition corrected by Paolo P. Lava, Apr 06 2009

More terms from Vincenzo Librandi, Jun 30 2009

STATUS

approved

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Last modified April 20 08:32 EDT 2019. Contains 322306 sequences. (Running on oeis4.)