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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
OFFSET
1,2
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
KEYWORD
nonn,easy
STATUS
approved