Number of symmetric, reduced unit interval schemes with n+1 intervals (n>=1).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =2a(6) =7a(7) =6a(8) =19a(9) =16a(10) =51a(11) =45a(12) =141a(13) =126a(14) =393a(15) =357a(16) =1107a(17) =1016a(18) =3139a(19) =2907a(20) =8953a(21) =8350a(22) =25653a(23) =24068a(24) =73789a(25) =69576a(26) =212941a(27) =201643a(28) =616227a(29) =585690