A013137 arctan(tanh(x)+tan(x))=2*x-16/3!*x^3+800/5!*x^5-97536/7!*x^7...

2, -16, 800, -97536, 22208000, -8125689856, 4360566579200, -3226435003416576, 3148058338141798400, -3916271639106285469696, 6050134274987713730969600, -11363591103950667093393801216

Offset

0,1

Links

Table of n, a(n) for n=0..11.

Crossrefs

Sequence in context: A012915 A012920 A013088 * A013990 A013005 A013000

Adjacent sequences: A013134 A013135 A013136 * A013138 A013139 A013140

Keyword

sign

Author

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

Status

approved