A diagonal of triangle A277410.

A277412

A diagonal of triangle A277410.

Terms

    a(0) =1a(1) =13a(2) =165a(3) =2310a(4) =36330a(5) =640710a(6) =12588345a(7) =273544425a(8) =6529047525a(9) =170116046100

External references