a(n) = (n+1)*a(n-1) + a(n-2), with a(0)=0, a(1)=1.
A058307
a(n) = (n+1)*a(n-1) + a(n-2), with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =13a(4) =68a(5) =421a(6) =3015a(7) =24541a(8) =223884a(9) =2263381a(10) =25121075a(11) =303716281a(12) =3973432728a(13) =55931774473a(14) =842950049823
External references
- oeis: A058307