A012017 - OEIS

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A012017

sec(sin(tan(x)))=1+1/2!*x^2+9/4!*x^4+153/6!*x^6+2993/8!*x^8...

1, 1, 9, 153, 2993, -72111, -33331719, -7328604631, -1581635839519, -356792088521439, -81022312424248727, -15576441107086727111, 22243831754082386577, 3229505766853670411015281

(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: A165232 A246641 A169958 * A130980 A133309 A228713

Adjacent sequences: A012014 A012015 A012016 * A012018 A012019 A012020

KEYWORD

sign

AUTHOR

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

STATUS

approved