A013140 exp(tanh(x)+arctan(x))=1+2*x+4/2!*x^2+4/3!*x^3-16/4!*x^4-88/5!*x^5...

1, 2, 4, 4, -16, -88, 64, 2496, 4096, -106624, -480896, 6875136, 54717440, -673392640, -7775895552, 99550288896, 1454255472640, -21279326830592, -360442602684416, 6159283224084480, 116460747215831040

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A019230 A298148 A088042 * A326773 A241211 A155720

Adjacent sequences: A013137 A013138 A013139 * A013141 A013142 A013143

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Status

approved