E.g.f. satisfies A(x) = exp( x^2 * A(x) / (1-x) ) / (1-x).

A378094

E.g.f. satisfies A(x) = exp( x^2 * A(x) / (1-x) ) / (1-x).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =24a(4) =204a(5) =2220a(6) =29640a(7) =469560a(8) =8623440a(9) =180306000a(10) =4231815840a(11) =110217270240

External references