a(n) = binomial(n, k) * (n - k)^k where k = floor(n/2).

A367274

a(n) = binomial(n, k) * (n - k)^k where k = floor(n/2).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =90a(6) =540a(7) =2240a(8) =17920a(9) =78750a(10) =787500a(11) =3592512a(12) =43110144a(13) =201885684a(14) =2826399576a(15) =13495173120a(16) =215922769920

External references