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A141044 Two 2's followed by all 1's. 10
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 October 19 23:44 EDT 2019. Contains 328244 sequences. (Running on oeis4.)