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A047668 Row 4 of array in A047666. 2
4, 17, 52, 129, 276, 529, 932, 1537, 2404, 3601, 5204, 7297, 9972, 13329, 17476, 22529, 28612, 35857, 44404, 54401, 66004, 79377, 94692, 112129, 131876, 154129, 179092, 206977, 238004, 272401, 310404, 352257, 398212, 448529 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

In this sequence if we do a forward difference, then the 3rd forward difference when considered as a sequence will be an arithmetic progression with common difference 8. [Gopalakrishnan (gopala498(AT)yahoo.co.in), Jun 05 2010]

LINKS

Table of n, a(n) for n=1..34.

FORMULA

a(n) = (1/3) * (n^4 + 8n^2 + 3).

G.f.: x*(4 - 3*x + 7*x^2 - x^3 + x^4)/(1-x)^5. - Maksym Voznyy (voznyy(AT)mail.ru), Jul 27 2009 [corrected by R. J. Mathar, Sep 16 2009]

CROSSREFS

Sequence in context: A334694 A228960 A131339 * A208658 A092091 A046995

Adjacent sequences:  A047665 A047666 A047667 * A047669 A047670 A047671

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 9 06:25 EDT 2021. Contains 343692 sequences. (Running on oeis4.)