a(n) = H(n)*n!/(floor(n/2))!, where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number.
A124078
a(n) = H(n)*n!/(floor(n/2))!, where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =11a(4) =25a(5) =137a(6) =294a(7) =2178a(8) =4566a(9) =42774a(10) =88572a(11) =1004532a(12) =2064504a(13) =27503832a(14) =56243184a(15) =860945040a(16) =1754322480a(17) =30342400560a(18) =61664980320
External references
- oeis: A124078