Expansion of g.f.: A(x) = Product_{n>=0} ( 1 + x*(1+x)^n )^( 1/2^(n+1) ).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =0a(5) =-2a(6) =-5a(7) =-3a(8) =27a(9) =145a(10) =382a(11) =-24a(12) =-6796a(13) =-44972a(14) =-167234a(15) =-105302a(16) =4182671a(17) =41042943a(18) =232150003a(19) =618910867a(20) =-4104725087a(21) =-76739338173a(22) =-670022786184