G.f. satisfies: A(x) = -1 + x + A(x)^2 + 1/A(x)^2.
A228714
G.f. satisfies: A(x) = -1 + x + A(x)^2 + 1/A(x)^2.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =245a(5) =2402a(6) =25235a(7) =277756a(8) =3161523a(9) =36909060a(10) =439516495a(11) =5317812722a(12) =65188448962a(13) =807898166866
External references
- oeis: A228714