For n >= 2, a(n) = n*u(n-1) + n*(n-1)*u(n-2), where u = A292932; a(1)=1.

A308351

For n >= 2, a(n) = n*u(n-1) + n*(n-1)*u(n-2), where u = A292932; a(1)=1.

Terms

    a(0) =1a(1) =4a(2) =18a(3) =128a(4) =1090a(5) =11232a(6) =134806a(7) =1849696a(8) =28550538a(9) =489656720a(10) =9237631150a(11) =190115847792

External references