A190297 Bisection of A013697.

1, 12, 57, 245, 1005, 4063, 16327, 65435, 261965, 1048259, 4193742, 16776218, 67107091, 268432305, 1073736223, 4294957340, 17179851485, 68719445272, 274877851009, 1099511528337, 4398046334325, 17592185730143, 70368743618958, 281474975717403, 1125899905076842

Offset: 1

Author

N. J. A. Sloane, May 13 2011

Keywords

• nonn

Formula

a(n) = floor(1/(zeta(2n)-1)).