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A156701 4*n^4 + 17*n^2 + 4. 2
4, 25, 136, 481, 1300, 2929, 5800, 10441, 17476, 27625, 41704, 60625, 85396, 117121, 157000, 206329, 266500, 339001, 425416, 527425, 646804, 785425, 945256, 1128361, 1336900, 1573129, 1839400, 2138161, 2471956, 2843425, 3255304, 3710425 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) = A087475(n)*A053755(n).

LINKS

Table of n, a(n) for n=0..31.

FORMULA

a(n) = (2*(n^2 - 1))^2 + (5*n)^2.

G.f.:(-4-25*x^4-11*x^3-51*x^2-5*x)/(x-1)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009]

PROG

(MAGMA)[4*n^4+17*n^2+4: n in [0..50]]; [From Vincenzo Librandi, Dec 27 2010]

CROSSREFS

A099761, A016850.

Sequence in context: A263440 A240631 A123660 * A273120 A220381 A015533

Adjacent sequences:  A156698 A156699 A156700 * A156702 A156703 A156704

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 13 2009

STATUS

approved

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Last modified December 3 04:39 EST 2016. Contains 278698 sequences.