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A014927 a(1)=1, a(n)=n*12^(n-1)+a(n-1). 1
1, 25, 457, 7369, 111049, 1604041, 22505929, 309160393, 4178995657, 55776799177, 736867805641, 9652968253897, 125562274081225, 1623467149388233, 20882244117621193, 267394589311003081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..900

FORMULA

a(n)=(1/121)*[1+12^n*(11*n-1)], with n>=1 [From Paolo P. Lava, Jan 13 2009]

a(1)=1, a(2)=25, a(n) = 24*a(n-1) - 144*a(n-2) + 1. - Vincenzo Librandi, Oct 23 2012

G.f.: x/((1 - x)*(1 - 12*x)^2). - Vincenzo Librandi, Oct 23 2012

MATHEMATICA

CoefficientList[Series[1/((1 - x)(1 - 12*x)^2), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 23 2012 *)

PROG

(MAGMA) I:=[1, 25]; [n le 2 select I[n] else 24*Self(n-1) - 144*Self(n-2) + 1: n in [1..20]]; // Vincenzo Librandi, Oct 23 2012

CROSSREFS

Sequence in context: A131279 A056069 A089386 * A059946 A118445 A000497

Adjacent sequences:  A014924 A014925 A014926 * A014928 A014929 A014930

KEYWORD

nonn,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified May 26 05:25 EDT 2019. Contains 323579 sequences. (Running on oeis4.)