E.g.f. A(x) satisfies A(x) = exp( x^3 * A(x) / (1-x) ) / (1-x).

A389869

E.g.f. A(x) satisfies A(x) = exp( x^3 * A(x) / (1-x) ) / (1-x).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =12a(4) =96a(5) =840a(6) =9000a(7) =118440a(8) =1794240a(9) =30542400a(10) =583027200a(11) =12360902400a(12) =287500752000

External references