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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110315 Diagonal sums of the Fibonacci related number triangle A110314. 1
1, -1, -1, -2, -5, -3, -11, -4, -19, -5, -29, -6, -41, -7, -55, -8, -71, -9, -89, -10, -109, -11, -131, -12, -155, -13, -181, -14, -209, -15, -239, -16, -271, -17, -305, -18, -341, -19, -379, -20, -419, -21, -461, -22, -505, -23, -551, -24, -599, -25, -649 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..50.

Index entries for linear recurrences with constant coefficients, signature (0,3,0,-3,0,1).

FORMULA

G.f.: (1-x-4x^2+x^3+x^4)/((1-x)^3*(1+x)^3); a(n)=3a(n-2)-3a(n-4)+a(n-6); a(n)=(6-n^2)(-1)^n/8-(n^2+4n-2)/8.

a(2n) = A110331(n). - R. J. Mathar, Aug 22 2012

CROSSREFS

Sequence in context: A120860 A259971 A091809 * A275677 A221183 A178174

Adjacent sequences:  A110312 A110313 A110314 * A110316 A110317 A110318

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jul 19 2005

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified February 19 16:56 EST 2018. Contains 299356 sequences. (Running on oeis4.)