Lah numbers: a(n) = n! * binomial(n-1, 4)/5!.
A001777
Lah numbers: a(n) = n! * binomial(n-1, 4)/5!.
Terms
- a(0) =1a(1) =30a(2) =630a(3) =11760a(4) =211680a(5) =3810240a(6) =69854400a(7) =1317254400a(8) =25686460800a(9) =519437318400
External references
- oeis: A001777