a(n) = (n+3)*a(n-1) + a(n-2), with a(0)=0, a(1)=1.
A058309
a(n) = (n+3)*a(n-1) + a(n-2), with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =31a(4) =222a(5) =1807a(6) =16485a(7) =166657a(8) =1849712a(9) =22363201a(10) =292571325a(11) =4118361751a(12) =62067997590a(13) =997206323191
External references
- oeis: A058309