A037788 Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0,1.

3, 20, 120, 721, 4329, 25976, 155856, 935137, 5610825, 33664952, 201989712, 1211938273, 7271629641, 43629777848, 261778667088, 1570672002529, 9424032015177, 56544192091064, 339265152546384, 2035590915278305

Offset

1,1

Links

Table of n, a(n) for n=1..20.

Index entries for linear recurrences with constant coefficients, signature (7,-7,7,-6).

Formula

G.f.: x*(3-x+x^2) / ( (x-1)*(6*x-1)*(x^2+1) ). - R. J. Mathar, May 01 2015

Mathematica

CoefficientList[Series[(3 - x + x^2)/((x - 1)*(6*x - 1)*(x^2 + 1)), {x, 0, 30}], x] (* Wesley Ivan Hurt, May 03 2017 *)
Table[FromDigits[PadRight[{}, n, {3, 2, 0, 1}], 6], {n, 20}] (* Michael De Vlieger, May 03 2017 *)

Crossrefs

Sequence in context: A164535 A001652 A128910 * A037669 A228066 A009125

Adjacent sequences: A037785 A037786 A037787 * A037789 A037790 A037791

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved