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Search: id:A013180
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A013180 sec(arctanh(x)+atan(x))=1+4/2!*x^2+80/4!*x^4+4480/6!*x^6... +0
1
1, 4, 80, 4480, 462080, 77248000, 18902835200, 6385348403200, 2843287396352000, 1614575957622784000, 1138477316012441600000, 976037590707833405440000, 999765439694232249958400000 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A013139 A013007 A013008 this_sequence A000316 A012106 A156103

Adjacent sequences: A013177 A013178 A013179 this_sequence A013181 A013182 A013183

KEYWORD

nonn

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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