-1057
domain: Z
Appears in sequences
- sech(tanh(x)*cos(x))=1-1/2!*x^2+25/4!*x^4-1057/6!*x^6+81905/8!*x^8...at n=3A012692
- E.g.f.: arctan(cosh(x)*tan(x))=x+3/3!*x^3-35/5!*x^5-1057/7!*x^7+59865/9!*x^9...at n=3A012767
- Expansion of (1-x) / (1+x^2+2*x^3).at n=22A078033
- a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = 1, a(2) = 0.at n=23A105578
- a(n) = (2*(-4)^((p-3)/4) + 1)/p, where p is the n-th prime congruent to 3 mod 4.at n=5A318908
- Dirichlet g.f.: zeta(s-2)^2 * (1 - 2^(3-s)) / zeta(s).at n=45A368929