A037674 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,2,3.

1, 4, 18, 75, 301, 1204, 4818, 19275, 77101, 308404, 1233618, 4934475, 19737901, 78951604, 315806418, 1263225675, 5052902701, 20211610804, 80846443218, 323385772875, 1293543091501, 5174172366004, 20696689464018, 82786757856075

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Index entries for linear recurrences with constant coefficients, signature (5,-5,5,-4).

Formula

G.f.: x*(1-x+3*x^2) / ( (x-1)*(4*x-1)*(x^2+1) ). - R. J. Mathar, May 04 2015

Crossrefs

Sequence in context: A026560 A180140 A245127 * A066259 A172159 A084213

Adjacent sequences: A037671 A037672 A037673 * A037675 A037676 A037677

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved