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%I #6 Aug 20 2012 17:11:08
%S 1,0,0,-3,0,-10,90,-308,1680,-13560,123480,-788568,7646760,-76432720,
%T 841320480,-8436217208,103473901440,-1320024546240,17546621595840,
%U -235942960528128,3481689023521920,-54132188358133120,858287202343992960,-14187715233218409728
%N n-th derivative of sech(x)^tan(x) at x=0.
%C sech(x) = 1/cosh(x).
%F E.g.f.: sech(x)^tan(x).
%p a:= n-> n!* coeff(series(sech(x)^tan(x), x, n+1), x, n):
%p seq (a(n), n=0..25); # _Alois P. Heinz_, Aug 20 2012
%t f[x_] := Sech[x]^Tan[x]; Table[Derivative[n][f][0],{n,0,25}]
%Y Cf. A215585, A215587.
%K sign
%O 0,4
%A _Michel Lagneau_, Aug 20 2012
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