a(n)= 3*(n-1)*a(n-1) +(n-1)*a(n-2), with a(0)=1, a(1)=1.
A108206
a(n)= 3*(n-1)*a(n-1) +(n-1)*a(n-2), with a(0)=1, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =20a(4) =189a(5) =2348a(6) =36165a(7) =665058a(8) =14219373a(9) =346585416a(10) =9485780589a(11) =288039271830
External references
- oeis: A108206