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A037492 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1. 0
2, 15, 107, 750, 5252, 36765, 257357, 1801500, 12610502, 88273515, 617914607, 4325402250, 30277815752, 211944710265, 1483612971857, 10385290803000, 72697035621002, 508879249347015, 3562154745429107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

Index to sequences with linear recurrences with constant coefficients, signature (7,1,-7).

FORMULA

a(n) = 7a(n-1) + a(n-2) - 7a(n-3).

G.f. x*(2+x) / ( (x-1)*(7*x-1)*(1+x) ). - R. J. Mathar, Nov 21 2011

CROSSREFS

Sequence in context: A037524 A037733 A037556 * A037572 A218686 A037740

Adjacent sequences:  A037489 A037490 A037491 * A037493 A037494 A037495

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 25 23:41 EDT 2013. Contains 225650 sequences.