G.f. A(x) satisfies: A( x*A(x)^2 - x^2*A(x) ) = x^4.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =2a(4) =-5a(5) =13a(6) =-40a(7) =126a(8) =-409a(9) =1363a(10) =-4617a(11) =15896a(12) =-55444a(13) =195480a(14) =-695636a(15) =2495118a(16) =-9011281a(17) =32741839a(18) =-119601339a(19) =438968354a(20) =-1618006837a(21) =5986803522a(22) =-22229028994a(23) =82798248894a(24) =-309299225632