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A144312 5*n*(5*n+1)/2. 5
0, 15, 55, 120, 210, 325, 465, 630, 820, 1035, 1275, 1540, 1830, 2145, 2485, 2850, 3240, 3655, 4095, 4560, 5050, 5565, 6105, 6670, 7260, 7875, 8515, 9180, 9870, 10585, 11325, 12090, 12880, 13695, 14535, 15400, 16290, 17205, 18145, 19110, 20100 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) = A000217(5*n).

LINKS

Table of n, a(n) for n=0..40.

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

FORMULA

a(n)=a(n-1)+25*n-10 (with a(0)=0). - Vincenzo Librandi, Nov 25 2010

PROG

(PARI) a(n)=5*n*(5*n+1)/2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

A014105, A081266, A033585.

Sequence in context: A043972 A226196 A179741 * A062025 A211797 A172436

Adjacent sequences:  A144309 A144310 A144311 * A144313 A144314 A144315

KEYWORD

nonn,easy

AUTHOR

Reinhard Zumkeller, Sep 17 2008

STATUS

approved

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Last modified October 21 04:44 EDT 2018. Contains 316404 sequences. (Running on oeis4.)