721280

Appears in sequences

• Expansion of exp(x)/cos(sinh(x)).at n=10A009290
• Expansion of log(1+sin(sinh(x))).at n=11A009328
• G.f.: (t^5 + 2*t^4 + t^3 + 2*t^2 + t) / (t^6 + t^5 - 2*t^4 - 5*t^3 - 2*t^2 + t + 1).at n=24A180510