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A022287 a(n) = n*(29*n + 1)/2. 2
0, 15, 59, 132, 234, 365, 525, 714, 932, 1179, 1455, 1760, 2094, 2457, 2849, 3270, 3720, 4199, 4707, 5244, 5810, 6405, 7029, 7682, 8364, 9075, 9815, 10584, 11382, 12209, 13065, 13950, 14864, 15807, 16779 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..34.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n) = 29*n + a(n-1) - 14 for n>0, a(0)=0. - Vincenzo Librandi, Aug 04 2010

G.f.: x*(15 + 14*x)/(1 - x)^3 . - R. J. Mathar, Aug 04 2016

a(n) = A000217(15*n) - A000217(14*n). - Bruno Berselli, Oct 13 2016

MATHEMATICA

Table[n (29 n + 1)/2, {n, 0, 40}] (* Bruno Berselli, Oct 13 2016 *)

CROSSREFS

Cf. similar sequences listed in A022289.

Sequence in context: A012691 A020187 A261798 * A223344 A206238 A064761

Adjacent sequences:  A022284 A022285 A022286 * A022288 A022289 A022290

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 22 13:18 EDT 2017. Contains 286872 sequences.