G.f. A(x) satisfies A(x)^2 = 1 +x + x*A(x)^5.

Terms

a(0) =1a(1) =1a(2) =2a(3) =8a(4) =35a(5) =169a(6) =862a(7) =4575a(8) =24999a(9) =139700a(10) =794684a(11) =4586377a(12) =26788423a(13) =158054285a(14) =940603900a(15) =5639481930a(16) =34032324940a(17) =206550445064