a(n) = n!*(1/C(n,0) - 1/C(n,1) - ... - 1/C(n,[ n/2 ])).
A024421
a(n) = n!*(1/C(n,0) - 1/C(n,1) - ... - 1/C(n,[ n/2 ])).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =14a(5) =84a(6) =516a(7) =3936a(8) =32544a(9) =305280a(10) =3123360a(11) =35112960a(12) =427559040a(13) =5629236480a(14) =79568697600
External references
- oeis: A024421