a(n) = 2*(n-1)*a(n-1)+(n-1)*a(n-2) with a(0)=0, a(1)=1.
A108205
a(n) = 2*(n-1)*a(n-1)+(n-1)*a(n-2) with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =10a(4) =66a(5) =568a(6) =6010a(7) =75528a(8) =1099462a(9) =18195616a(10) =337416246a(11) =6930281080a(12) =156177762466
External references
- oeis: A108205