login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100135 a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 2^k. 3
1, 1, 1, 1, 1, 1, 3, 9, 21, 41, 71, 113, 173, 269, 443, 777, 1413, 2577, 4615, 8065, 13813, 23413, 39691, 67801, 116973, 203337, 354519, 617345, 1071197, 1851677, 3192731, 5501033, 9485621, 16381185, 28330119, 49035777, 84883621, 146875717 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (3,-3,1,0,0,2).

FORMULA

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

a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) + 2*a(n-6).

CROSSREFS

Cf. A098575, A100134, A100136.

Sequence in context: A029494 A059774 A064999 * A024173 A097119 A146608

Adjacent sequences:  A100132 A100133 A100134 * A100136 A100137 A100138

KEYWORD

easy,nonn,changed

AUTHOR

Paul Barry, Nov 06 2004

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 19 03:10 EDT 2021. Contains 348073 sequences. (Running on oeis4.)