a(n) = (n!)^2/phi(n!), where phi is Euler's totient function.
A123476
a(n) = (n!)^2/phi(n!), where phi is Euler's totient function.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =72a(4) =450a(5) =2700a(6) =22050a(7) =176400a(8) =1587600a(9) =15876000a(10) =192099600a(11) =2305195200a(12) =32464832400a(13) =454507653600
External references
- oeis: A123476