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A055820 T(n,n-3), array T as in A055818. 1
1, 11, 24, 43, 69, 103, 146, 199, 263, 339, 428, 531, 649, 783, 934, 1103, 1291, 1499, 1728, 1979, 2253, 2551, 2874, 3223, 3599, 4003, 4436, 4899, 5393, 5919, 6478, 7071, 7699, 8363, 9064, 9803, 10581, 11399, 12258 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 3..10000

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

FORMULA

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

MATHEMATICA

Join[{1}, Table[(n^3+3n^2-10n-6)/6, {n, 4, 50}]] (* or *) Join[{1}, LinearRecurrence[ {4, -6, 4, -1}, {11, 24, 43, 69}, 50]] (* Harvey P. Dale, Sep 18 2011 *)

CROSSREFS

Sequence in context: A098603 A274620 A053061 * A114167 A108302 A182689

Adjacent sequences:  A055817 A055818 A055819 * A055821 A055822 A055823

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 28 2000

STATUS

approved

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Last modified October 21 07:15 EDT 2019. Contains 328292 sequences. (Running on oeis4.)