Expansion of B(x)^2, where B(x) is the g.f. of A230322.

Terms

a(0) =1a(1) =0a(2) =2a(3) =-2a(4) =1a(5) =-2a(6) =1a(7) =2a(8) =-2a(9) =4a(10) =-6a(11) =4a(12) =-4a(13) =0a(14) =5a(15) =-6a(16) =13a(17) =-14a(18) =9a(19) =-10a(20) =1a(21) =12a(22) =-16a(23) =26a(24) =-32a(25) =24a(26) =-19a(27) =2a(28) =22a(29) =-34