G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} C(2*n,k)^2 * x^k * A(x)^k]* x^n/n ).
A199257
G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} C(2*n,k)^2 * x^k * A(x)^k]* x^n/n ).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =18a(4) =86a(5) =408a(6) =2075a(7) =10787a(8) =57655a(9) =313643a(10) =1733450a(11) =9700574a(12) =54867895a(13) =313145033a(14) =1801150861a(15) =10430094658a(16) =60758092753a(17) =355795743385
External references
- oeis: A199257