A186248 2n-th derivative of sec(x)^cos(x) at x=0.

1, 1, -1, -44, -211, 9136, 118799, -9894884, -368001271, 3949758496, -1062959453221, -352302017500124, -54987975498787651, -11177493084346370144, -3145848334837840227961, -988952736939184411495964, -349477151478120199840810351, -141758901275895434356815281984

Offset

0,4

Comments

sec(x) = 1/cos(x).

The sequence gives only 2n-th derivatives because (2n+1)-th derivatives are 0.

Links

Table of n, a(n) for n=0..17.

Mathematica

f[x_] := Sec[x]^Cos[x]; Table[Derivative[2*n] [f][0], {n, 0, 18}]

Crossrefs

Cf. A215677.

Sequence in context: A189547 A026908 A183246 * A215677 A122235 A250454

Adjacent sequences: A186245 A186246 A186247 * A186249 A186250 A186251

Keyword

sign

Author

Michel Lagneau, Aug 18 2012

Status

approved