login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A017837 Expansion of 1/(1 - x^5 - x^6). 7
1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 2, 1, 0, 0, 1, 3, 3, 1, 0, 1, 4, 6, 4, 1, 1, 5, 10, 10, 5, 2, 6, 15, 20, 15, 7, 8, 21, 35, 35, 22, 15, 29, 56, 70, 57, 37, 44, 85, 126, 127, 94, 81, 129, 211, 253, 221, 175, 210, 340, 464, 474, 396, 385, 550, 804, 938, 870, 781, 935, 1354, 1742, 1808, 1651, 1716, 2289, 3096 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,12
COMMENTS
Number of compositions of n into parts 5 and 6. - Joerg Arndt, Jun 27 2013
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000 (terms 0..1000 from Vincenzo Librandi)
FORMULA
a(n) = a(n-6) + a(n-5). - Jon E. Schoenfield, Aug 07 2006
MATHEMATICA
CoefficientList[Series[1 / (1 - Total[x^Range[5, 6]]), {x, 0, 50}], x] (* Vincenzo Librandi Jun 27 2013 *)
PROG
(PARI) Vec(1/(1-x^5-x^6)+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012
(Magma) m:=70; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/(1-x^5-x^6))); /* or */ I:=[1, 0, 0, 0, 0, 1]; [n le 6 select I[n] else Self(n-5)+Self(n-6): n in [1..70]]; // Vincenzo Librandi, Jun 27 2013
CROSSREFS
Column 5 of A306713.
Cf. A099132.
Sequence in context: A144225 A159854 A127840 * A145153 A255517 A188816
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 24 11:15 EST 2024. Contains 370303 sequences. (Running on oeis4.)