A214446 n*(n^2-2*n-1)

-2, -2, 6, 28, 70, 138, 238, 376, 558, 790, 1078, 1428, 1846, 2338, 2910, 3568, 4318, 5166, 6118, 7180, 8358, 9658, 11086, 12648, 14350, 16198, 18198, 20356, 22678, 25170, 27838, 30688, 33726, 36958, 40390, 44028, 47878

Offset

1,1

Links

Table of n, a(n) for n=1..37.

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

Formula

a(n) = -2*A110427(n). G.f. 2*x*(-1+3*x+x^2) / (x-1)^4 . - R. J. Mathar, Jul 18 2012

Prog

(PARI) a(n) = n*(n^2 - 2*n - 1)  \\ Michel Marcus, Jul 15 2013

Crossrefs

Sequence in context: A292831 A076726 A032272 * A179320 A004304 A326907

Adjacent sequences: A214443 A214444 A214445 * A214447 A214448 A214449

Keyword

sign,easy

Author

Marco Piazzalunga, Jul 18 2012

Status

approved