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A055831 T(n,n-4), where T is the array in A055830. 1
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; internal format)
OFFSET

4,1

FORMULA

(n-3)(n^2+6n-10)/6, n>3.

CROSSREFS

Sequence in context: A048021 A133268 A056108 * A037984 A073361 A155013

Adjacent sequences:  A055828 A055829 A055830 * A055832 A055833 A055834

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), May 28 2000

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.