login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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: A013582 A240631 A123660 * A220381 A015533 A207410

Adjacent sequences:  A156698 A156699 A156700 * A156702 A156703 A156704

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 13 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 17 22:43 EST 2014. Contains 252040 sequences.