A141044 - OEIS

A141044

Two 2's followed by all 1's.

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

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OFFSET

0,1

COMMENTS

Essentially the same as the "all ones" sequence A000012. - M. F. Hasler, May 30 2020

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