a(n) = n! (1/C(n,0) + 1/C(n,1) + ... + 1/C(n,[ n/2 ])).
A024419
a(n) = n! (1/C(n,0) + 1/C(n,1) + ... + 1/C(n,[ n/2 ])).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =34a(5) =156a(6) =924a(7) =6144a(8) =48096a(9) =420480a(10) =4134240a(11) =44720640a(12) =530444160a(13) =6824805120a(14) =94787884800
External references
- oeis: A024419