a(0)=1, a(n)= n^(n-2)(7n^2-3n+2)/6 (n>0).
A081917
a(0)=1, a(n)= n^(n-2)(7n^2-3n+2)/6 (n>0).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =272a(5) =3375a(6) =50976a(7) =907578a(8) =18612224a(9) =432061533a(10) =11200000000a(11) =320680885976
External references
- oeis: A081917