A013140 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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