G.f. B(x) satisfies: B(x) = (1 - x^2*B(x)^2) / (1 - 2*x*B(x))^2.
A341962
G.f. B(x) satisfies: B(x) = (1 - x^2*B(x)^2) / (1 - 2*x*B(x))^2.
Terms
- a(0) =1a(1) =4a(2) =27a(3) =224a(4) =2070a(5) =20444a(6) =211239a(7) =2255200a(8) =24680862a(9) =275408456a(10) =3121711758a(11) =35842765872a(12) =415999482912
External references
- oeis: A341962