Number of strictly non-overlapping holeless polyhexes of perimeter 2n, counted up to rotations and turning over.

A258206

Number of strictly non-overlapping holeless polyhexes of perimeter 2n, counted up to rotations and turning over.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =3a(7) =2a(8) =12a(9) =14a(10) =50a(11) =97a(12) =312a(13) =744a(14) =2291a(15) =6186a(16) =18714a(17) =53793a(18) =162565a(19) =482416a(20) =1467094a(21) =4436536a(22) =13594266a(23) =41640513a(24) =128564463a(25) =397590126a(26) =1236177615a(27) =3852339237a(28) =12053032356a(29) =37802482958

External references