Number of "sets of even lists" for even n, cf. A000262.
A088026
Number of "sets of even lists" for even n, cf. A000262.
Terms
- a(0) =1a(1) =2a(2) =36a(3) =1560a(4) =122640a(5) =15150240a(6) =2695049280a(7) =650948538240
External references
- oeis: A088026