A037730 Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,0,3.

2, 9, 36, 147, 590, 2361, 9444, 37779, 151118, 604473, 2417892, 9671571, 38686286, 154745145, 618980580, 2475922323, 9903689294, 39614757177, 158459028708, 633836114835, 2535344459342, 10141377837369, 40565511349476

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Index entries for linear recurrences with constant coefficients, signature (4,0,0,1,-4).

Formula

G.f.: ( x*(2+x+3*x^3) ) / ( (x-1)*(4*x-1)*(1+x)*(1+x^2) ). - R. J. Mathar, Oct 14 2015

Crossrefs

Sequence in context: A003125 A055841 A037521 * A029874 A052834 A289805

Adjacent sequences: A037727 A037728 A037729 * A037731 A037732 A037733

Keyword

nonn,base

Author

Clark Kimberling

Status

approved