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A047668 Row 4 of array in A047666. 2

%I

%S 4,17,52,129,276,529,932,1537,2404,3601,5204,7297,9972,13329,17476,

%T 22529,28612,35857,44404,54401,66004,79377,94692,112129,131876,154129,

%U 179092,206977,238004,272401,310404,352257,398212,448529

%N Row 4 of array in A047666.

%C 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]

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

%F 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]

%K nonn

%O 1,1

%A _N. J. A. Sloane_

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)