0,1

See A054871 for definitions and key links.

Sequence can be also be seen as a(0) = 3, a(1) = 12, a(n) = H_{n-1}(10,10) for n>1. - Natan Arie Consigli, Apr 22 2015; edited by Danny Rorabaugh, Oct 20 2015

Table of n, a(n) for n=0..4.

Wikipedia, Hyperoperation

a(0) = H_0(10,2) = 2+1 = 3;

a(1) = H_1(10,2) = 10+2 = 12;

a(2) = H_2(10,2) = 10*2 = 10+10 = 20;

a(3) = H_3(10,2) = 10^2 = 10*10 = 100;

a(4) = H_4(10,2) = 10^^2 = 10^10 = 10000000000;

a(5) = H_5(10,2) = 10^^^2 = 10^^10 = 10^10^10^10^10^10^10^10^10^10 = ... .

Cf. A054871.

Sequence in context: A212760 A143268 A193558 * A080767 A043465 A074276

Adjacent sequences: A256128 A256129 A256130 * A256132 A256133 A256134

nonn

Natan Arie Consigli, Mar 15 2015

First terms corrected and hyperoperator notation implemented by Danny Rorabaugh, Oct 20 2015

approved