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A163661 a(n) = n*(2*n^2+5*n+17)/2. 1
0, 12, 35, 75, 138, 230, 357, 525, 740, 1008, 1335, 1727, 2190, 2730, 3353, 4065, 4872, 5780, 6795, 7923, 9170, 10542, 12045, 13685, 15468, 17400, 19487, 21735, 24150, 26738, 29505, 32457, 35600, 38940, 42483, 46235, 50202, 54390, 58805, 63453 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Row sums from A163657

FORMULA

a(m) = sum_(n=1,...,m) A163657(m,n) = A163655(m)+2*m.

a(n) = 4*a(n-1)-6*a(n-2)+4*a(n-3)-a(n-4). G.f.: x*(12-13*x+7*x^2)/(x-1)^4.

CROSSREFS

Cf. A153047, A163657

Sequence in context: A077293 A053682 A033570 * A142074 A102085 A058968

Adjacent sequences:  A163658 A163659 A163660 * A163662 A163663 A163664

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)ti.it), Aug 02 2009

EXTENSIONS

Edited, a(31) corrected - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 05 2009

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Last modified February 14 14:47 EST 2012. Contains 205623 sequences.