Next term is too large to include.
Table of n, a(n) for n=1..3.
Alexander Karpov, Generalized knockout tournaments, National Research University Higher School of Economics. WP7/2017/03.
Alexander Karpov, Generalized knockout tournaments.
a(n) = (3^n)!/6^((3^n-1)/2).
f[n_] := (3^n)!/6^((3^n - 1)/2); Array[f, 3] (* Robert G. Wilson v, Dec 27 2017 *)
Cf. A067667 (number of knockout tournament seedings with two players in each match).
Sequence in context: A091034 A294165 A259079 * A308456 A175145 A142444
Adjacent sequences: A296503 A296504 A296505 * A296507 A296508 A296509
Alexander Karpov, Dec 13 2017