G.f. satisfies: A(x) = 1 + x*A(x)^4/A(-x).

Terms

a(0) =1a(1) =1a(2) =5a(3) =26a(4) =195a(5) =1303a(6) =11076a(7) =81910a(8) =740151a(9) =5782175a(10) =54176573a(11) =438029432a(12) =4203769940a(13) =34798104500a(14) =339699218160