Expansion of g.f. 1/2 + 1/(1+sqrt(1-8*x+8*x^2)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =56a(5) =284a(6) =1516a(7) =8384a(8) =47600a(9) =275808a(10) =1624352a(11) =9694912a(12) =58510912a(13) =356467392a(14) =2189331648a(15) =13540880384a(16) =84265071360a(17) =527232146944