Gaussian binomial coefficient [ n,n/2 ] for q=3.

A006104

Gaussian binomial coefficient [ n,n/2 ] for q=3.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =13a(4) =130a(5) =1210a(6) =33880a(7) =925771a(8) =75913222a(9) =6174066262

External references