a(n) = Sum(a(2i-1)*a(n-2i+1), i = 1,2,...,[ (n+2)/4 ]).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =6a(9) =10a(10) =16a(11) =25a(12) =39a(13) =70a(14) =117a(15) =190a(16) =315a(17) =555a(18) =950a(19) =1595a(20) =2700a(21) =4806a(22) =8346a(23) =14267a(24) =24593a(25) =43772a(26) =76730a(27) =133072a(28) =231389a(29) =415124