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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A115525 Periodic {1,1,-2,0,1,0,-1,0,0,1,-1,-1}. 1
1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Diagonal sums of number triangle A115524.

LINKS

Table of n, a(n) for n=0..71.

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

FORMULA

G.f.: (1+2x-x^3-2x^4-x^5)/(1+x+x^2-x^4-x^5-x^6).

a(n)=(1/792)*{-133*(n mod 12)-[(n+1) mod 12]+131*[(n+2) mod 12]-67*[(n+3) mod 12]-[(n+4) mod 12]-67*[(n+5) mod 12]+65*[(n+6) mod 12]+65*[(n+7) mod 12]-67*[(n+8) mod 12]-133*[(n+9) mod 12]+197*[(n+10) mod 12]-[(n+11) mod 12]}, with n>=0 - Paolo P. Lava, Jun 11 2007

CROSSREFS

Sequence in context: A070100 A070095 A060951 * A241910 A065717 A070092

Adjacent sequences:  A115522 A115523 A115524 * A115526 A115527 A115528

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jan 25 2006

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)