The sequence S defined in A058562.

A058575

The sequence S defined in A058562.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =7a(4) =81a(5) =1311a(6) =27273a(7) =693351a(8) =20830113a(9) =722035503a(10) =28364200569

External references