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A013137
arctan(tanh(x)+tan(x))=2*x-16/3!*x^3+800/5!*x^5-97536/7!*x^7...
0
2, -16, 800, -97536, 22208000, -8125689856, 4360566579200, -3226435003416576, 3148058338141798400, -3916271639106285469696, 6050134274987713730969600, -11363591103950667093393801216
OFFSET
0,1
CROSSREFS
Sequence in context: A012915 A012920 A013088 * A013990 A013005 A013000
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved