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!)
A106251 Expansion of (1-x+x^2+x^3+x^5)/(1-x-x^6+x^7). 0
1, 0, 1, 2, 2, 3, 4, 3, 4, 5, 5, 6, 7, 6, 7, 8, 8, 9, 10, 9, 10, 11, 11, 12, 13, 12, 13, 14, 14, 15, 16, 15, 16, 17, 17, 18, 19, 18, 19, 20, 20, 21, 22, 21, 22, 23, 23, 24, 25, 24, 25, 26, 26, 27, 28, 27, 28, 29, 29, 30, 31, 30, 31, 32, 32, 33, 34, 33, 34, 35, 35, 36, 37, 36, 37, 38 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
FORMULA
G.f.: (1+x^2+2x^3+2x^4+3x^5+2x^6+3x^7+2x^8+x^9+x^10)/(1-x^6)^2; a(n)=sum{k=0..n, -mu(k mod 6)}.
MATHEMATICA
LinearRecurrence[{1, 0, 0, 0, 0, 1, -1}, {1, 0, 1, 2, 2, 3, 4}, 80] (* Harvey P. Dale, Oct 04 2021 *)
CROSSREFS
Sequence in context: A185977 A204006 A369879 * A134478 A051162 A122872
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 27 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 11:44 EDT 2024. Contains 371241 sequences. (Running on oeis4.)