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A158498 a(n) = 1/2*(n^3-6*n^2+13*n-6). 3
1, 2, 3, 7, 17, 36, 67, 113, 177, 262, 371, 507, 673, 872, 1107, 1381, 1697, 2058, 2467, 2927, 3441, 4012, 4643, 5337, 6097, 6926, 7827, 8803, 9857, 10992, 12211, 13517, 14913, 16402, 17987, 19671, 21457, 23348, 25347, 27457, 29681 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a(n) = 1/2*(n^3-6*n^2+13*n-6).

G.f.: x*(1-2*x+x^2+3*x^3) / (-1+x)^4.

CROSSREFS

Sequence in context: A030086 A078721 A077007 * A155548 A191033 A105554

Adjacent sequences:  A158495 A158496 A158497 * A158499 A158500 A158501

KEYWORD

nonn

AUTHOR

Alexander R. Povolotsky (pevnev(AT)juno.com), Jan 13 2011

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.