A012832 sec(sec(x)*arcsinh(x))=1+1/2!*x^2+13/4!*x^4+445/6!*x^6+24953/8!*x^8...

1, 1, 13, 445, 24953, 2394425, 320731013, 61303017269, 15028480222577, 4798610670513265, 1869279471006738045, 898190788867995464109, 509366426382836133377513, 343690844382622422166331305

Offset

0,3

Links

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

Crossrefs

Sequence in context: A260852 A383274 A372812 * A102075 A218586 A251601

Adjacent sequences: A012829 A012830 A012831 * A012833 A012834 A012835

Keyword

nonn

Author

Patrick Demichel

Status

approved