A037558 Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,1.

2, 19, 172, 1550, 13951, 125560, 1130042, 10170379, 91533412, 823800710, 7414206391, 66727857520, 600550717682, 5404956459139, 48644608132252, 437801473190270, 3940213258712431

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+x^2) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

Crossrefs

Sequence in context: A037526 A037735 A224753 * A037494 A037574 A037742

Adjacent sequences: A037555 A037556 A037557 * A037559 A037560 A037561

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved