A037684 - OEIS

A037684

Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3,2.

1, 7, 52, 366, 2563, 17941, 125590, 879132, 6153925, 43077475, 301542328, 2110796298, 14775574087, 103429018609, 724003130266, 5068021911864, 35476153383049, 248333073681343, 1738331515769404

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OFFSET

1,2

LINKS

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

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

FORMULA

a(n) = 7a(n-1) + a(n-4) - 7a(n-5)

G.f.: ( x*(1+3*x^2+2*x^3) ) / ( (x-1)*(7*x-1)*(1+x)*(x^2+1) ). - R. J. Mathar, Oct 11 2015

CROSSREFS

Sequence in context: A254946 A258845 A037593 * A246513 A015559 A097180

Adjacent sequences: A037681 A037682 A037683 * A037685 A037686 A037687

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved