Number of polyhexes with n hexagons, having reflectional symmetry (see Harary and Read for precise definition).

A002215

Number of polyhexes with n hexagons, having reflectional symmetry (see Harary and Read for precise definition).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =10a(6) =20a(7) =36a(8) =72a(9) =137a(10) =274a(11) =543a(12) =1086a(13) =2219a(14) =4438a(15) =9285a(16) =18570a(17) =39587a(18) =79174a(19) =171369a(20) =342738a(21) =751236a(22) =1502472a(23) =3328218a(24) =6656436a(25) =14878455a(26) =29756910a(27) =67030785a(28) =134061570a(29) =304036170

External references