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A014930 a(1)=1, a(n) = n*15^(n-1) + a(n-1). 1
1, 31, 706, 14206, 267331, 4823581, 84557956, 1451432956, 24517448581, 408951042331, 6752105339206, 110549175651706, 1797251568229831, 29043982525261081, 466937872906120456, 7473240118999870456 (list; graph; refs; listen; history; text; internal format)
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

a(n) = (1/196)*(1+15^n*(14*n-1)), with n >= 1. - Paolo P. Lava, Jan 13 2009

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: A020981 A006097 A000565 * A196988 A061252 A096049

Adjacent sequences:  A014927 A014928 A014929 * A014931 A014932 A014933

KEYWORD

nonn,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified August 7 08:08 EDT 2020. Contains 336274 sequences. (Running on oeis4.)