226785

Appears in sequences

• Expansion of log(1+tanh(x)/cos(x)).at n=9A009400
• arctanh(sec(x)*tanh(x))=x+3/3!*x^3+65/5!*x^5+2723/7!*x^7...at n=4A012837
• E.g.f.: log(tanh(x)+cos(x))=x-2/2!*x^2+3/3!*x^3-12/4!*x^4+65/5!*x^5...at n=9A013152
• a(n) = 4*n^3 + 5*n^2 + 2*n + 1.at n=38A204674