a(n) = 2A(n)/C(n) where A(n) = A180874(n) and C(n) = Catalan(n) = A000108(n).
A188664
a(n) = 2A(n)/C(n) where A(n) = A180874(n) and C(n) = Catalan(n) = A000108(n).
Terms
- a(0) =2a(1) =1a(2) =2a(3) =8a(4) =52a(5) =495a(6) =6470a(7) =111034a(8) =2419928a(9) =65269092a(10) =2133844440a(11) =83133090480
External references
- oeis: A188664