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Search: id:A012028
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A012028 sec(sin(arctan(x)))=1+1/2!*x^2-7/4!*x^4+121/6!*x^6-3823/8!*x^8... +0
1
1, 1, -7, 121, -3823, 186961, -12464695, 967217161, -51115216735, -15922673810399, 12685061907297305, -7463929930799687399, 4531120544938557395633, -3032728078954072676445839 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A156955 A095752 A113267 this_sequence A094088 A012043 A012103

Adjacent sequences: A012025 A012026 A012027 this_sequence A012029 A012030 A012031

KEYWORD

sign

AUTHOR

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

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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