G.f. satisfies: A(x) = (1 + x*A(x)^4)*(1 + x^2*A(x)^4).
A199877
G.f. satisfies: A(x) = (1 + x*A(x)^4)*(1 + x^2*A(x)^4).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =31a(4) =222a(5) =1727a(6) =14179a(7) =120930a(8) =1060992a(9) =9514463a(10) =86818391a(11) =803516167a(12) =7524700644a(13) =71169939341a(14) =678877680077
External references
- oeis: A199877