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A274990 a(n) = 2[n](n-2). 1

%I

%S -1,1,0,2,4,65536

%N a(n) = 2[n](n-2).

%C x[n]y is the square-bracket notation for hyperoperations.

%C See A054871 for details and key links.

%e a(0) = 2[0]-2 = -1;

%e a(1) = 2[1]-1 = 1;

%e a(2) = 2[2]0 = 0;

%e a(3) = 2[3]1 = 2;

%e a(4) = 2[4]2 = 4;

%e a(6) = 2[5]3 = 65536;

%e a(7) = 2[6]4 = 2[6]2[6]2 = 2[7]3.

%Y Cf. A001695 (2[n]n).

%K sign

%O 0,4

%A _Natan Arie Consigli_, Sep 24 2016

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)