login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A012231 exp(arctan(atanh(x)))=1+x+1/2!*x^2+1/3!*x^3+1/4!*x^4+9/5!*x^5... 0
1, 1, 1, 1, 1, 9, 49, 281, 1345, 13233, 105441, 1179729, 10336833, 144386553, 1580651409, 25501409961, 316289380737, 5869292202465, 83559601907649, 1744083324947745, 27709107620492673, 643531258862953065 (list; graph; refs; listen; history; internal format)
OFFSET

0,6

CROSSREFS

Sequence in context: A081655 A146798 A055428 * A123270 A114040 A090390

Adjacent sequences:  A012228 A012229 A012230 * A012232 A012233 A012234

KEYWORD

nonn

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 08:17 EST 2012. Contains 205727 sequences.