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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131298 A difference of Fibonacci and Padovan numbers. 2
1, 1, 2, 4, 6, 11, 18, 30, 50, 82, 135, 221, 361, 589, 959, 1560, 2535, 4116, 6679, 10832, 17560, 28457, 46103, 74674, 120928, 195802, 316995, 513148, 830608, 1344372, 2175796, 3521249, 5698477 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Diagonal sums of A104730.

LINKS

Table of n, a(n) for n=0..32.

Index entries for linear recurrences with constant coefficients, signature (1,2,0,-2,-1).

FORMULA

G.f.: (1-x^2)/((1-x-x^2)*(1-x^2-x^3)) = (1+x)/(1-x-x^2) - x*(1+x)/(1-x^2-x^3).

a(n) = Sum_{k=0..floor(n/2)} C(n-k+1,k) - C(k,n-2k+1).

CROSSREFS

Sequence in context: A026636 A026658 A138688 * A168445 A185192 A007053

Adjacent sequences:  A131295 A131296 A131297 * A131299 A131300 A131301

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jun 26 2007

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 May 21 15:32 EDT 2019. Contains 323444 sequences. (Running on oeis4.)