G.f. A(x) satisfies A(x) = 1/( 1 - x*A(x)^2/(1 - x*A(x)^2) )^2.
A378668
G.f. A(x) satisfies A(x) = 1/( 1 - x*A(x)^2/(1 - x*A(x)^2) )^2.
Terms
- a(0) =1a(1) =2a(2) =13a(3) =112a(4) =1104a(5) =11778a(6) =132374a(7) =1543740a(8) =18505996a(9) =226632616a(10) =2823110349a(11) =35659080952a(12) =455652487060
External references
- oeis: A378668