-673
domain: Z
Appears in sequences
- Expansion of tan(x)*cos(tanh(x)).at n=3A009730
- Expansion of e.g.f. tan(x)/cosh(sin(x)), odd powers only.at n=3A009761
- Expansion of Product_{k>=1} (1 - x^k)^9.at n=18A010817
- sech(sin(tanh(x)))=1-1/2!*x^2+17/4!*x^4-673/6!*x^6+48481/8!*x^8...at n=3A012050
- a(n) = A174817(n) - Mnr; where Mnr = A001228(26) = 808017424794512875886459904961710757005754368000000000, also called the Monster number, cf. A003131.at n=9A174818
- a(n) = coefficient of x^(2n) in the expansion of the modular form Product_{k>=1} (1-x^k)^n.at n=9A262310
- Bisection of A262310.at n=4A262538