0,1

This is the shifted sequence of the Ackermann-Petèr numbers (A046859).

x[n]y is the square-bracket notation for hyperoperations. See A054871 for details and key links.

Table of n, a(n) for n=0..3.

a(n) = A046859 + 3.

a(0) = 2[0]3 = 4;

a(1) = 2[1]4 = 6;

a(2) = 2[2]5 = 10;

a(3) = 2[3]6 = 64;

a(4) = 2[4]7 = 2^2^2^65536.

Cf. A046859 (2[n](n+3)-3), A274990 (2[n](n-2)), A001695 (2[n]n).

Sequence in context: A242502 A136838 A234276 * A109378 A132149 A129235

Adjacent sequences: A274988 A274989 A274990 * A274992 A274993 A274994

nonn,bref

Natan Arie Consigli, Sep 24 2016

approved