Triangular array read by rows: a(n,k) = Sum_{d|k} mu(d)*U(n,k/d)/n if k|n else 0, where U(n,k) = A047916(n,k) (1<=k<=n).
A047919
Triangular array read by rows: a(n,k) = Sum_{d|k} mu(d)*U(n,k/d)/n if k|n else 0, where U(n,k) = A047916(n,k) (1<=k<=n).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =2a(4) =0a(5) =0a(6) =2a(7) =0a(8) =0a(9) =4a(10) =4a(11) =0a(12) =0a(13) =0a(14) =20a(15) =2a(16) =4a(17) =6a(18) =0a(19) =0a(20) =108a(21) =6a(22) =0a(23) =0a(24) =0a(25) =0a(26) =0a(27) =714a(28) =4a(29) =4
External references
- oeis: A047919