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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 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.)