Directed genus of the binary de Bruijn graph D_n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =7a(6) =15a(7) =35a(8) =75a(9) =163a(10) =337a(11) =709a(12) =1458a(13) =3001a(14) =6135a(15) =12529a(16) =25468a(17) =51739a(18) =104829a(19) =212205a(20) =428916a(21) =866215a(22) =1747527a(23) =3523213a(24) =7097895a(25) =14291683a(26) =28760643a(27) =57852469a(28) =116321445a(29) =233798623