a(n) = C(n+1)^2 - 2*C(n+1)*C(n) + C(n)^2, where C() is a Catalan number; a(0) = 1.
A338727
a(n) = C(n+1)^2 - 2*C(n+1)*C(n) + C(n)^2, where C() is a Catalan number; a(0) = 1.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =81a(4) =784a(5) =8100a(6) =88209a(7) =1002001a(8) =11778624a(9) =142420356a(10) =1763160100a(11) =22268399076a(12) =286105172544
External references
- oeis: A338727