A013451 exp(tan(x)-tanh(x))=1+4/3!*x^3+160/6!*x^6+544/7!*x^7+17920/9!*x^9...

1, 0, 0, 4, 0, 0, 160, 544, 0, 17920, 261120, 707584, 3942400, 149360640, 1538068480, 5242548224, 111522611200, 2782416732160, 25458261360640, 166243180478464, 5279051703910400, 109528131284500480