19712000

Appears in sequences

• Expansion of e.g.f. sec(tan(x) - tanh(x)) (even-indexed coefficients only).at n=6A013455
• sec(arctan(x)-arctanh(x))=1+160/6!*x^6+691200/10!*x^10+19712000/12!*x^12...at n=6A013466
• Number of permutations of n elements without cycles whose length is a multiple of 3.at n=11A102736
• Number of permutations on [n] admitting a ninth root.at n=11A247007
• Denominators from expansion of e.g.f. (x^3/3!)/(e^x-1-x-(x^2/2!)).at n=9A248964