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A144560 Ten times hexagonal numbers: 10*n*(2*n-1). 1
0, 10, 60, 150, 280, 450, 660, 910, 1200, 1530, 1900, 2310, 2760, 3250, 3780, 4350, 4960, 5610, 6300, 7030, 7800, 8610, 9460, 10350, 11280, 12250, 13260, 14310, 15400, 16530, 17700, 18910, 20160, 21450, 22780, 24150, 25560, 27010 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Sequence found by reading the line from 0, in the direction 0, 10,..., in the square spiral whose vertices are the generalized dodecagonal numbers A195162. - Omar E. Pol, Sep 18 2011

LINKS

Ivan Panchenko, Table of n, a(n) for n = 0..1000

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

FORMULA

a(n) = 20n^2 - 10n = A000384(n)*10 = A002939(n)*5 = A152745(n)*2.

a(n) = a(n-1)+40*n-30  (with a(0)=0). - Vincenzo Librandi, Dec 14 2010

PROG

(PARI) a(n)=10*n*(2*n-1) \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A000384, A002939, A152745, A152994.

Sequence in context: A066290 A065641 A121874 * A076160 A266732 A283727

Adjacent sequences:  A144557 A144558 A144559 * A144561 A144562 A144563

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Jan 01 2009

STATUS

approved

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Last modified December 8 09:53 EST 2019. Contains 329862 sequences. (Running on oeis4.)