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A012882 exp(sech(x)*arctanh(x))=1+x+1/2!*x^2-3/4!*x^4+20/5!*x^5+165/6!*x^6... 0
1, 1, 1, 0, -3, 20, 165, 784, 1337, 26256, 356745, 4466176, 31874997, 435729216, 5714452653, 104111460608, 1296863374193, 23261262303488, 357091592679441, 7794968497086464, 131690816886952045 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

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

CROSSREFS

Sequence in context: A123355 A258791 A192509 * A063017 A276315 A145329

Adjacent sequences:  A012879 A012880 A012881 * A012883 A012884 A012885

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified July 26 00:58 EDT 2017. Contains 289798 sequences.