a(n) = (n-1)!*Sum_{k=1..n, gcd(k,n)=1} H(k), where H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.
A119769
a(n) = (n-1)!*Sum_{k=1..n, gcd(k,n)=1} H(k), where H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =154a(5) =394a(6) =8028a(7) =38856a(8) =490992a(9) =2995632a(10) =80627040a(11) =355102560a(12) =13575738240a(13) =88085232000
External references
- oeis: A119769