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A055831 T(n,n-4), where T is the array in A055830. 3
5, 15, 31, 54, 85, 125, 175, 236, 309, 395, 495, 610, 741, 889, 1055, 1240, 1445, 1671, 1919, 2190, 2485, 2805, 3151, 3524, 3925, 4355, 4815, 5306, 5829, 6385, 6975, 7600, 8261, 8959, 9695, 10470, 11285, 12141, 13039 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

Table of n, a(n) for n=4..42.

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

FORMULA

a(n)  = (n-3)*(n^2+6*n-10)/6, n>3.

G.f.: x^4*(5-5*x+x^2) / (x-1)^4 . - R. J. Mathar, Mar 13 2016

CROSSREFS

Sequence in context: A225325 A133268 A056108 * A037984 A298032 A073361

Adjacent sequences:  A055828 A055829 A055830 * A055832 A055833 A055834

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 28 2000

STATUS

approved

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Last modified December 7 09:33 EST 2019. Contains 329843 sequences. (Running on oeis4.)