A014930 a(1)=1, a(n) = n*15^(n-1) + a(n-1).

1, 31, 706, 14206, 267331, 4823581, 84557956, 1451432956, 24517448581, 408951042331, 6752105339206, 110549175651706, 1797251568229831, 29043982525261081, 466937872906120456, 7473240118999870456

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Index entries for linear recurrences with constant coefficients, signature (31,-255,225).

Formula

G.f.: x/((1 - x)*(1 - 15*x)^2). - Stefano Spezia, Mar 11 2020

Prog

(PARI) a(n) = (1+15^n*(14*n-1))/196; \\ Jinyuan Wang, Mar 11 2020

Crossrefs

Sequence in context: A362512 A006097 A000565 * A196988 A358179 A061252

Adjacent sequences: A014927 A014928 A014929 * A014931 A014932 A014933

Keyword

nonn,easy

Author

Olivier Gérard

Status

approved