Expansion of g.f.: x^2*(1 + x - x^2)/(1 - 2*x^2 - 2*x^4).

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =6a(7) =10a(8) =16a(9) =28a(10) =44a(11) =76a(12) =120a(13) =208a(14) =328a(15) =568a(16) =896a(17) =1552a(18) =2448a(19) =4240a(20) =6688a(21) =11584a(22) =18272a(23) =31648a(24) =49920a(25) =86464a(26) =136384a(27) =236224a(28) =372608a(29) =645376