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!)
A367655 G.f. A(x) satisfies A(x) = 1 / (1 - x - x * (1 + x) * A(x^2)). 4
1, 2, 5, 14, 39, 111, 314, 894, 2539, 7224, 20536, 58413, 166102, 472410, 1343448, 3820748, 10865805, 30901790, 87882171, 249931270, 710786078, 2021427153, 5748794540, 16349171957, 46495891170, 132231060820, 376055838670, 1069476434880, 3041515866674 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(0) = 1; a(n) = a(n-1) + Sum_{k=0..n-1} a(floor(k/2)) * a(n-1-k).
PROG
(PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=v[i]+sum(j=0, i-1, v[j\2+1]*v[i-j])); v;
CROSSREFS
Cf. A127680.
Sequence in context: A368672 A026135 A201778 * A105641 A027035 A102406
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 26 2023
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 12:51 EST 2024. Contains 370303 sequences. (Running on oeis4.)