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A012137 arctan(arcsin(arctanh(x))) = x + (1/3!)*x^3 + (17/5!)*x^5 + (673/7!)*x^7 + (54305/9!)*x^9 + ... 0
1, 1, 17, 673, 54305, 7334273, 1497501873, 430436005665, 165573876222529, 82074493484054017, 50922938856050558289, 38644611846710150572193, 35205379514991276523808353, 37909794281251146499011279233 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A009158 A012050 A012157 * A171198 A309410 A201311

Adjacent sequences:  A012134 A012135 A012136 * A012138 A012139 A012140

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified November 22 16:26 EST 2019. Contains 329396 sequences. (Running on oeis4.)