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A013148
tanh(tanh(x)+arctan(x))=2*x-20/3!*x^3+872/5!*x^5-82848/7!*x^7...
0
2, -20, 872, -82848, 13615232, -3427600128, 1224824628224, -589372636243968, 367372633732907008, -287938978919399424000, 277156456747324043952128, -321405895510495023427223552
OFFSET
0,1
CROSSREFS
Sequence in context: A356691 A163594 A193483 * A276892 A006547 A290883
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved