A012045 sech(sin(arcsinh(x)))=1-1/2!*x^2+13/4!*x^4-421/6!*x^6+25817/8!*x^8...

1, -1, 13, -421, 25817, -2565961, 375964645, -76201822061, 20411701862065, -6981810963526801, 2968895846823113405, -1536132530083569544501, 950209903347072336087433, -692439473656550310042291161

Offset

0,3

Links

Table of n, a(n) for n=0..13.

Crossrefs

Sequence in context: A012023 A081442 A100872 * A012109 A012084 A114759

Adjacent sequences: A012042 A012043 A012044 * A012046 A012047 A012048

Keyword

sign

Author

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

Status

approved