G.f. satisfies: A(x) = 1 + x*A(x)^3 + 2*x^2*A(x)^2 + x^3*A(x).
A200028
G.f. satisfies: A(x) = 1 + x*A(x)^3 + 2*x^2*A(x)^2 + x^3*A(x).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =23a(4) =123a(5) =714a(6) =4371a(7) =27789a(8) =181703a(9) =1214166a(10) =8254642a(11) =56915989a(12) =397055129a(13) =2797402939a(14) =19875881883a(15) =142255845279
External references
- oeis: A200028