A037637 Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,3.

2, 19, 174, 1568, 14113, 127020, 1143182, 10288639, 92597754, 833379788, 7500418093, 67503762840, 607533865562, 5467804790059, 49210243110534, 442892187994808, 3986029691953273

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Index entries for linear recurrences with constant coefficients, signature (9,0,1,-9).

Formula

G.f.: x*(2+x+3*x^2) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011

Crossrefs

Sequence in context: A037494 A037574 A037742 * A163067 A221904 A124262

Adjacent sequences: A037634 A037635 A037636 * A037638 A037639 A037640

Keyword

nonn,base

Author

Clark Kimberling

Status

approved