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A156701 a(n) = 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.

Index entries for linear recurrences with constant coefficients, signature (5, -10, 10, -5, 1).

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. - Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009

MATHEMATICA

Table[4n^4+17n^2+4, {n, 0, 40}] (* or *) LinearRecurrence[{5, -10, 10, -5, 1}, {4, 25, 136, 481, 1300}, 50] (* Harvey P. Dale, Nov 08 2017 *)

PROG

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

CROSSREFS

Cf. A099761, A016850.

Sequence in context: A240631 A123660 A304842 * 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 May 14 16:48 EDT 2021. Contains 343898 sequences. (Running on oeis4.)