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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...
0
1, 2, 4, 4, -16, -88, 64, 2496, 4096, -106624, -480896, 6875136, 54717440, -673392640, -7775895552, 99550288896, 1454255472640, -21279326830592, -360442602684416, 6159283224084480, 116460747215831040
OFFSET
0,2
CROSSREFS
Sequence in context: A019230 A298148 A088042 * A326773 A241211 A155720
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved