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A186249 2n-th derivative of sec(x)^sec(x) at x=0. 1
1, 1, 11, 256, 10541, 672136, 61001951, 7445096296, 1172998147241, 231333927486736, 55747918840676411, 16100914826854576456, 5485174647349481371661, 2175023364205612725532456, 992565740287786208277022391, 516241740263310751317668520736 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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..15.

MATHEMATICA

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

CROSSREFS

Cf. A186250.

Sequence in context: A177912 A128405 A052782 * A186250 A324327 A142208

Adjacent sequences:  A186246 A186247 A186248 * A186250 A186251 A186252

KEYWORD

nonn

AUTHOR

Michel Lagneau, Aug 18 2012

STATUS

approved

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Last modified August 7 22:44 EDT 2020. Contains 336279 sequences. (Running on oeis4.)