G.f. satisfies A(x) = 1 + x * A(x * (1 - x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-2a(5) =-1a(6) =7a(7) =0a(8) =-44a(9) =69a(10) =276a(11) =-1471a(12) =675a(13) =20407a(14) =-90560a(15) =-20552a(16) =2141700a(17) =-10558223a(18) =-675239a(19) =329376824a(20) =-2106253225a(21) =2364924062a(22) =67114942438a(23) =-621638176430