Expansion of g.f. A(x) = B(x^2)/(1 - 2*x*B(x^2)) where B(x) = 1 + 2*x*B(x)^3 is the g.f. of A153231.

A367389

Expansion of g.f. A(x) = B(x^2)/(1 - 2*x*B(x^2)) where B(x) = 1 + 2*x*B(x)^3 is the g.f. of A153231.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =16a(4) =52a(5) =152a(6) =512a(7) =1568a(8) =5392a(9) =16992a(10) =59232a(11) =190336a(12) =669952a(13) =2183680a(14) =7742464a(15) =25512448a(16) =90974464a(17) =302368256a(18) =1083175424a(19) =3625435136a(20) =13036688384a(21) =43889186816a(22) =158323564544a(23) =535639556096

External references