A012876 sec(sech(x)*log(x+1))=1+1/2!*x^2-3/3!*x^3+4/4!*x^4-40/5!*x^5...

1, 0, 1, -3, 4, -40, 370, -2100, 19052, -224712, 2295380, -27161420, 388309832, -5572831680, 85093639488, -1453531202760, 26088826973648, -491011275101888, 9922199896825168, -211576194636993072

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A032836 A167760 A012472 * A300882 A348225 A172144

Adjacent sequences: A012873 A012874 A012875 * A012877 A012878 A012879

Keyword

sign

Author

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

Status

approved