A037635 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,3.

2, 15, 108, 758, 5307, 37152, 260066, 1820463, 12743244, 89202710, 624418971, 4370932800, 30596529602, 214175707215, 1499229950508, 10494609653558, 73462267574907, 514235873024352, 3599651111170466

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Index entries for linear recurrences with constant coefficients, signature (7,0,1,-7).

Formula

G.f.: x*(2+x+3*x^2) / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 29 2015

Crossrefs

Sequence in context: A218686 A279087 A037740 * A154635 A062808 A162773

Adjacent sequences: A037632 A037633 A037634 * A037636 A037637 A037638

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved