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 A186250 2n-th derivative of sech(x)^sech(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 sech(x) = 1/cosh(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_] := Sech[x]^Sech[x]; Table[Derivative[2*n] [f][0], {n, 0, 18}] CROSSREFS Cf. A186249. Sequence in context: A128405 A052782 A186249 * A324327 A142208 A168466 Adjacent sequences: A186247 A186248 A186249 * A186251 A186252 A186253 KEYWORD sign AUTHOR Michel Lagneau, Aug 18 2012 STATUS approved

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Last modified August 8 02:48 EDT 2024. Contains 375018 sequences. (Running on oeis4.)