A037492 - OEIS

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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

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OFFSET

1,1

LINKS

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

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

FORMULA

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

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

CROSSREFS

Sequence in context: A037733 A308938 A037556 * A037572 A218686 A279087

Adjacent sequences: A037489 A037490 A037491 * A037493 A037494 A037495

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved