a(1)=1, a(n) = 2*(n^(n-1)-1)/(n-1) for n >= 2.
A093461
a(1)=1, a(n) = 2*(n^(n-1)-1)/(n-1) for n >= 2.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =42a(4) =312a(5) =3110a(6) =39216a(7) =599186a(8) =10761680a(9) =222222222a(10) =5187484920a(11) =135092431034
External references
- oeis: A093461