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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A171880 a(n) = a(n-1) + a(n-2)*a(n-3) + a(n-4)*a(n-5)^a(n-6) 0
0, 0, 0, 1, 1, 1, 2, 4, 7, 16, 46, 166, 1014, 47066, 12348246366, 66716521529543607970475115226 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

COMMENTS

First 6 terms are {0,0,0,1,1,1}; thereafter apply the recurrence. Note that 0^0=1.

LINKS

Table of n, a(n) for n=0..15.

R. Munafo, Accelerating Sequences

MATHEMATICA

nxt[{a_, b_, c_, d_, e_, f_}]:={b, c, d, e, f, f+e*d+c*Max[1, b]^Max[1, a]}; NestList[ nxt, {0, 0, 0, 1, 1, 1}, 14][[All, 1]] (* Harvey P. Dale, Jan 18 2019 *)

CROSSREFS

Sequence in context: A192464 A137568 A010355 * A171874 A113878 A293793

Adjacent sequences:  A171877 A171878 A171879 * A171881 A171882 A171883

KEYWORD

nonn

AUTHOR

Robert Munafo, Jan 21 2010

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 18 15:41 EDT 2019. Contains 328162 sequences. (Running on oeis4.)