5468176

Appears in sequences

• a(1) = 0, a(2) = 1, a(3) = 1, a(4) = 7; thereafter, a(n) = a(n-1) + (n-1)*a(n-2).at n=14A086828
• E.g.f. satisfies: A(x) = x*(tan(exp(A(x))-1)+1).at n=8A133984