a(n) = ((n^3 - 4n + 1)*A000166(n) + (-1)^(n+1)*(n-1)^2) / 6.
A105928
a(n) = ((n^3 - 4n + 1)*A000166(n) + (-1)^(n+1)*(n-1)^2) / 6.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =6a(4) =72a(5) =780a(6) =8520a(7) =97650a(8) =1189104a(9) =15441048a(10) =213816240a(11) =3152287710a(12) =49369524600a(13) =819340272036
External references
- oeis: A105928