-3414

Appears in sequences

• Expansion of e.g.f: sech(arcsinh(x)+tan(x)).at n=3A013102
• a(n) = 2*a(n-1) - 3*a(n-2) + 2*a(n-3) with a(0) = 1, a(1) = 5, a(2) = 6.at n=26A105577