a(n) = (n-4)^(n-3) - (n-3)^(n-4) + 1.

A111454

a(n) = (n-4)^(n-3) - (n-3)^(n-4) + 1.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =18a(4) =400a(5) =7850a(6) =162288a(7) =3667650a(8) =91171008a(9) =2486784402a(10) =74062575400

External references