Define k by A280864(k) = 2^n; then a(n) = A280864(k-1)/2, or -1 if that is not an integer.

A282024

Define k by A280864(k) = 2^n; then a(n) = A280864(k-1)/2, or -1 if that is not an integer.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =19a(4) =41a(5) =74a(6) =131a(7) =302a(8) =523a(9) =1031a(10) =2458a(11) =4132a(12) =8209a(13) =16381a(14) =32832a(15) =84614a(16) =131101a(17) =262139

External references