a(n) = number of special odd permutations of 2*n+1.
A003110
a(n) = number of special odd permutations of 2*n+1.
Terms
- a(0) =0a(1) =2a(2) =2a(3) =108a(4) =2028a(5) =32870a(6) =1213110a(7) =46493784a(8) =2310521000a(9) =137466038346
External references
- oeis: A003110