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

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