A012033 sech(sin(sinh(x)))=1-1/2!*x^2+5/4!*x^4-13/6!*x^6-407/8!*x^8...

1, -1, 5, -13, -407, 30151, -1142483, 19202427, 3747342929, -722092683505, 76341208430549, -2313301317273981, -1769780901329435719, 628518840135423728599, -125498832189487922441219

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Crossrefs

Sequence in context: A067135 A122900 A145557 * A007540 A290171 A157250

Adjacent sequences: A012030 A012031 A012032 * A012034 A012035 A012036

Keyword

sign

Author

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

Status

approved