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%I #14 Mar 07 2019 19:57:51
%S 2,362,1199762,19881945722,1018678051268642,125201903398211562122,
%T 31486196823329536613622962,14521097220214080357933048011162,
%U 11334671748951741252208875241156729922,14082992180269280951672083015859201930825642,26533369529542348661168440120005660275350301107922
%N tan(sec(x) - sech(x)) = 2/2!*x^2 + 362/6!*x^6 + 1199762/10!*x^10 ...
%p seq(coeff(series(tan(sec(x)-sech(x)),x,100),x,2+4*n)*(2+4*n)!,n=0..23); # Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010
%t With[{nn=50},Take[CoefficientList[Series[Tan[Sec[x]-Sech[x]],{x,0,nn}],x] Range[0,nn]!,{3,-1,4}]] (* _Harvey P. Dale_, Mar 07 2019 *)
%K nonn
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010
%E Further terms from _N. J. A. Sloane_, Dec 17 2011