A094234 a(n) = period of terms in quasi-periodic continued fraction expansion of 2^n*tanh(1).

1, 5, 10, 32, 76, 184, 408, 944, 2088, 4680, 10168, 22192, 47952

Offset

0,2

Links

Table of n, a(n) for n=0..12.

Example

E.g. tanh(1)=[0,1,3,5,7,9,...] pattern being /2n+1/ (length=1), so a(1) = 1.
2*tanh(1) = [1; 1, 1, 10, 3, 1, 1, 4, 22, 6, 1, 1, 7, 34, 9...]. It is the concatenation of parts of the form [1, 1, 3*m-2, 12*m-2, 3*m] for m = 1,2,3..., so a(2) = 5.

Crossrefs

Sequence in context: A174467 A005201 A221304 * A052538 A240413 A304215

Adjacent sequences: A094231 A094232 A094233 * A094235 A094236 A094237

Keyword

nonn,more,changed

Author

Thomas Baruchel, Jun 03 2004

Extensions

More terms from Thomas Baruchel, Aug 26 2004

Status

approved