Number of line segments in an H tree with n levels that have no correspondence with the toothpicks of the toothpick structure of A139250 after n-th stage.

A220499

Number of line segments in an H tree with n levels that have no correspondence with the toothpicks of the toothpick structure of A139250 after n-th stage.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =16a(6) =40a(7) =92a(8) =212a(9) =464a(10) =968a(11) =1980a(12) =4016a(13) =8096a(14) =16260a(15) =32612a(16) =65364a(17) =130896a(18) =261960a(19) =524092a(20) =1048368a(21) =2096928a(22) =4194052a(23) =8388324a(24) =16776912a(25) =33554112a(26) =67108516a(27) =134217344a(28) =268435032a(29) =536870428

External references