G.f. A(x) satisfies A(x) = 1 + x + x^4*A(x)^2.

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =2a(6) =1a(7) =0a(8) =2a(9) =6a(10) =6a(11) =2a(12) =5a(13) =20a(14) =30a(15) =20a(16) =19a(17) =70a(18) =140a(19) =140a(20) =112a(21) =266a(22) =630a(23) =840a(24) =762a(25) =1176a(26) =2814a(27) =4620a(28) =5049a(29) =6204