Expansion of g.f. (1 - x*C(x)) * (1 - x*C(x^2)) / (1 - 4*x), where C(x) = 1 + x*C(x)^2 is the Catalan function (A000108).
A370539
Expansion of g.f. (1 - x*C(x)) * (1 - x*C(x^2)) / (1 - 4*x), where C(x) = 1 + x*C(x)^2 is the Catalan function (A000108).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =118a(5) =462a(6) =1824a(7) =7208a(8) =28558a(9) =113274a(10) =449848a(11) =1787968a(12) =7111716a(13) =28303548a(14) =112700032a(15) =448939744a(16) =1788990454a(17) =7131191202a(18) =28433681832a(19) =113398298336a(20) =452345641820
External references
- oeis: A370539