a(1) = 1, a(2) = 2, a(n) = (n-1)*a(n-1) - (n-2)*a(n-2).
A067078
a(1) = 1, a(2) = 2, a(n) = (n-1)*a(n-1) - (n-2)*a(n-2).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =11a(5) =35a(6) =155a(7) =875a(8) =5915a(9) =46235a(10) =409115a(11) =4037915a(12) =43954715a(13) =522956315a(14) =6749977115a(15) =93928268315
External references
- oeis: A067078