G.f. satisfies: A(x) = -1/(1+x) + A(x)^2 + 1/A(x)^2.
A228923
G.f. satisfies: A(x) = -1/(1+x) + A(x)^2 + 1/A(x)^2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =21a(4) =172a(5) =1575a(6) =15414a(7) =157873a(8) =1671110a(9) =18136057a(10) =200714844a(11) =2256618493a(12) =25701805501a(13) =295922645873
External references
- oeis: A228923