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!)
A283918 a(n) = (1 + Sum_{j=1..K-2} a(n-j)*a(n-j-1))/a(n-K) with a(1),...,a(K)=1, where K=6. 2
1, 1, 1, 1, 1, 1, 5, 9, 53, 529, 28565, 15139445, 86494677165, 145497982245073197, 237449075542565847670095797, 65308811677507188262439443927593494833685, 542885242695872953856134304668084060854561472461643166998594129 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
MATHEMATICA
a[n_]:= If[n<7, 1, (1 + Sum[a[n - j] * a[n -j - 1], {j, 4}])/a[ n - 6]]; Table[a[n], {n, 23}] (* Indranil Ghosh, Mar 18 2017 *)
PROG
(PARI) a(n) = if(n<7, 1, (1 + sum(j=1, 4, a(n - j) * a(n - j - 1)))/a(n - 6));
for(n=1, 24, print1(a(n), ", ")) \\ Indranil Ghosh, Mar 18 2017
CROSSREFS
Cf. A077458 (K=4), A283819 (K=5), this sequence (K=6), A283820 (K=7), A283920 (K=8), A283821 (K=9).
Sequence in context: A369155 A124421 A262918 * A284382 A143554 A222536
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 17 2017
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 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)