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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A030035 a(n+1) = Sum_{k=0..floor(3*n/4)} a(k) * a(n-k). 1
 1, 1, 1, 2, 4, 9, 17, 38, 89, 213, 480, 1151, 2810, 6978, 16497, 40731, 101680, 256491, 623916, 1568966, 3972773, 10130647, 25044032, 63573638, 162478685, 417322917, 1049096179, 2687278965, 6917001254, 17882746627, 45391766669, 116995255065, 302689722551 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 PROG (PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=1, nn, v[n+2]=sum(k=1, 1+(3*n)\4, v[k]*v[n+2-k])); v; } \\ Jinyuan Wang, Mar 18 2020 CROSSREFS Cf. A000992, A030034, A030038. Sequence in context: A136326 A362033 A059973 * A123431 A049961 A321736 Adjacent sequences: A030032 A030033 A030034 * A030036 A030037 A030038 KEYWORD nonn AUTHOR N. J. A. Sloane EXTENSIONS More terms from Jinyuan Wang, Mar 18 2020 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.

Last modified December 5 01:00 EST 2023. Contains 367565 sequences. (Running on oeis4.)