a(0)=1; a(1)=0; a(n) = 2*(n-1)*(a(n-1) + a(n-2)).
A053871
a(0)=1; a(1)=0; a(n) = 2*(n-1)*(a(n-1) + a(n-2)).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =8a(4) =60a(5) =544a(6) =6040a(7) =79008a(8) =1190672a(9) =20314880a(10) =387099936a(11) =8148296320a(12) =187778717632
External references
- oeis: A053871