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A037486 Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,2. 0
1, 11, 100, 902, 8119, 73073, 657658, 5918924, 53270317, 479432855, 4314895696, 38834061266, 349506551395, 3145558962557, 28310030663014, 254790275967128, 2293112483704153 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

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

FORMULA

a(n) = 9*a(n-1) + a(n-2) - 9*a(n-3).

G.f.: x*(1+2*x)/((1-9*x)*(1-x^2)). a(n) = (11*9^n+4*(-1)^n-15)/80. - Bruno Berselli, Jan 20 2011

CROSSREFS

Sequence in context: A081906 A098296 A037542 * A103720 A127806 A036929

Adjacent sequences:  A037483 A037484 A037485 * A037487 A037488 A037489

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 20 00:15 EDT 2013. Contains 226416 sequences.