From reversion of e.g.f. for squares.

A066399

From reversion of e.g.f. for squares.

Terms

    a(0) =0a(1) =1a(2) =-4a(3) =39a(4) =-616a(5) =13505a(6) =-379296a(7) =12995983a(8) =-525688192a(9) =24519144609

External references