-6095

Appears in sequences

• a(n) = a(n-1) - (n-1)(n-2)a(n-2).at n=8A002019
• Expansion of e.g.f. cos(arctanh(x)), even powers only.at n=4A102059
• a(0) = -1, otherwise a(n) = (-1)^n*(n^3 - 15*n^2 + 2*n - 12)/6.at n=39A173248