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A037540 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1. 0
1, 9, 64, 449, 3145, 22016, 154113, 1078793, 7551552, 52860865, 370026057, 2590182400, 18131276801, 126918937609, 888432563264, 6219027942849, 43533195599945, 304732369199616, 2133126584397313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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*(1+x)^2 / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

CROSSREFS

Sequence in context: A000846 A231822 A049684 * A037484 A013566 A056769

Adjacent sequences:  A037537 A037538 A037539 * A037541 A037542 A037543

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified December 6 06:58 EST 2016. Contains 278775 sequences.