%I
%S 1,1,1,7,3,631,37,12731,37481,771163,590381,195597517,8025539,
%T 205204695149,5456117628779,3973785585851,3056850228539,
%U 168086791499223239
%N Numerator of [x^n] of the Taylor series arccosh(exp(x)tanh(x))= x+x^2/2 x^3/8 7*x^4/48 +3*x^5/128 +631*x^6/11520 +37*x^7/15360 12731*x^8/645120 ...
%C The e.g.f. at x/2 seems to admit an integer representation: arccosh(exp(x)tanh(x)) = 2*x/(2*1!) +4*x^2/(2^2*2!) 6*x^3/(2^3*3!) 56*x^4/(2^4*4!) +90*x^5/(2^5*5!) +2524*x^6/(2^6*6!) ...
%K sign,frac
%O 1,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Values replaced by numerators.  R. J. Mathar, Dec 22 2011
