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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110387 a(1) = 1, a(2) = a(1) + 1, a(3) = a(2)^2 + a(1) + 1; a(n+1) = a(n)^n + a(n-1)^(n-1) + ... + a(2)^2 + a(1) + 1. 0
1, 2, 6, 222, 2428912878, 84539502447168140812774402430429967456348471246 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

The next term is too large to include.

EXAMPLE

a(3) = 2^2 + 1 + 1 = 6.

a(4)=6^3+2^2+1^1+1=222.

MAPLE

a[1]:=1: for n from 1 to 6 do a[n+1]:=1+sum(a[j]^j, j=1..n) od: seq(a[n], n=1..7); (Deutsch)

MATHEMATICA

lst={}; s=1; Do[s+=s^n; AppendTo[lst, s], {n, 3!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 10 2008]

CROSSREFS

Sequence in context: A091439 A176782 A013083 * A158682 A201626 A100359

Adjacent sequences:  A110384 A110385 A110386 * A110388 A110389 A110390

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 26 2005

EXTENSIONS

Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu) and Erich Friedman (efriedma(AT)stetson.edu), Jul 31 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 06:46 EST 2012. Contains 205867 sequences.