A037747 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,0,1.

2, 17, 119, 834, 5840, 40883, 286181, 2003268, 14022878, 98160149, 687121043, 4809847302, 33668931116, 235682517815, 1649777624705, 11548443372936, 80839103610554, 565873725273881, 3961116076917167

Offset

1,1

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*(2+3*x+x^3) ) / ( (x-1)*(7*x-1)*(1+x)*(1+x^2) ). - R. J. Mathar, Oct 15 2015

Crossrefs

Sequence in context: A294271 A203123 A198043 * A037628 A037754 A037642

Adjacent sequences: A037744 A037745 A037746 * A037748 A037749 A037750

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved