G.f.: A(x) = Sum_{n>=0} 2^(n^2)*A000108(n)*(1-2^n*x)^n*x^n where A000108 is the Catalan numbers.
A168554
G.f.: A(x) = Sum_{n>=0} 2^(n^2)*A000108(n)*(1-2^n*x)^n*x^n where A000108 is the Catalan numbers.
Terms
- a(0) =1a(1) =2a(2) =28a(3) =2304a(4) =856576a(5) =1351057408
External references
- oeis: A168554