Expansion of g.f.: (1-4*x*C)/(1-5*x*C) where C = (1/2-1/2*(1-4*x)^(1/2))/x = g.f. for Catalan numbers A000108.
A076026
Expansion of g.f.: (1-4*x*C)/(1-5*x*C) where C = (1/2-1/2*(1-4*x)^(1/2))/x = g.f. for Catalan numbers A000108.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =37a(4) =230a(5) =1434a(6) =8952a(7) =55917a(8) =349374a(9) =2183230a(10) =13643972a(11) =85270626a(12) =532926716a(13) =3330739972a(14) =20816939100a(15) =130105200765a(16) =813155081070
External references
- oeis: A076026