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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A218032 G.f. A(x) satisfies A(x) = 1 + x / (1- x * A(x^2)). 0
1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 35, 57, 94, 154, 254, 417, 687, 1129, 1859, 3057, 5032, 8277, 13623, 22412, 36883, 60684, 99862, 164312, 270384, 444899, 732093, 1204629, 1982228, 3261701, 5367131, 8831505, 14532200, 23912499, 39347839, 64746320, 106539481, 175309363, 288469809 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

What does this sequence count?

LINKS

Table of n, a(n) for n=0..42.

PROG

(PARI)

N=66;  R=O('x^N);  x='x+R;

F = 1 + x;

for (k=1, N+1, F = 1 + x / (1- x * subst(F, 'x, 'x^2) ) + R; );

Vec(F)

CROSSREFS

Sequence in context: A321656 A005170 A226999 * A229194 A304790 A306486

Adjacent sequences:  A218029 A218030 A218031 * A218033 A218034 A218035

KEYWORD

nonn

AUTHOR

Joerg Arndt, Oct 19 2012

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 November 14 15:10 EST 2019. Contains 329126 sequences. (Running on oeis4.)