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A141044 Two 2's followed by all 1's. 9
2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..104.

Wikipedia, Hyperoperation

Index entries for linear recurrences with constant coefficients, signature (1).

FORMULA

G.f.: 2*(1+x)-x^2/(x-1). - R. J. Mathar, May 10 2001

a(n) = H_n(1, 1), where H_n is the n-th hyperoperator (cf. A054871). - Natan Arie' Consigli, Feb 26 2015

PROG

(PARI) a(n)=if(n>1, 1, 2) \\ Charles R Greathouse IV, Oct 07 2015

CROSSREFS

Cf. A054871.

Sequence in context: A124034 A211312 A085978 * A064284 A030409 A030407

Adjacent sequences:  A141041 A141042 A141043 * A141045 A141046 A141047

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Jul 31 2008

EXTENSIONS

Edited by N. J. A. Sloane, Mar 03 2010

STATUS

approved

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Last modified November 15 11:35 EST 2018. Contains 317238 sequences. (Running on oeis4.)