A009240 Expansion of exp(tan(tan(x))).

1, 1, 1, 5, 17, 113, 673, 5669, 48033, 494081, 5387009, 65835109, 871869745, 12394430129, 192177458593, 3124415825605, 55316788832065, 1014225530028161, 20139680768683777, 411568350375102789

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Mathematica

Exp[ Tan[ Tan[ x ] ] ]

Crossrefs

Sequence in context: A203114 A198027 A216924 * A180387 A324411 A012174

Adjacent sequences: A009237 A009238 A009239 * A009241 A009242 A009243

Keyword

nonn,easy

Author

R. H. Hardin

Extensions

Extended and signs tested Mar 15 1997 by Olivier Gérard.

Status

approved