Expansion of B(x)^2, where B(x) is the g.f. of A108483.

Terms

a(0) =1a(1) =2a(2) =1a(3) =0a(4) =0a(5) =-2a(6) =-2a(7) =2a(8) =4a(9) =2a(10) =-1a(11) =-4a(12) =-6a(13) =-4a(14) =5a(15) =12a(16) =7a(17) =-2a(18) =-10a(19) =-16a(20) =-9a(21) =12a(22) =25a(23) =16a(24) =-5a(25) =-24a(26) =-34a(27) =-18a(28) =26a(29) =54