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A144314 3*n*(6*n+1). 4
0, 21, 78, 171, 300, 465, 666, 903, 1176, 1485, 1830, 2211, 2628, 3081, 3570, 4095, 4656, 5253, 5886, 6555, 7260, 8001, 8778, 9591, 10440, 11325, 12246, 13203, 14196, 15225, 16290, 17391, 18528, 19701, 20910, 22155, 23436, 24753, 26106, 27495 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

a(n) = A000217(6*n) = A014105(3*n) = A081266(2*n).

FORMULA

a(n)=a(n-1)+36*n-15 (with a(0)=0). [From Vincenzo Librandi, Dec 27 2010]

CROSSREFS

A014105, A081266, A033585, A144312.

Sequence in context: A143206 A182754 A045559 * A010009 A172082 A068085

Adjacent sequences:  A144311 A144312 A144313 * A144315 A144316 A144317

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 17 2008

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Last modified February 14 10:43 EST 2012. Contains 205614 sequences.