Number of free hexagonal polyominoes with n cells with at most 3 collinear cell centers on any line in the plane.

A377756

Number of free hexagonal polyominoes with n cells with at most 3 collinear cell centers on any line in the plane.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =55a(6) =169a(7) =477a(8) =1245a(9) =2750a(10) =5380a(11) =8989a(12) =12674a(13) =14741a(14) =13928a(15) =10297a(16) =6185a(17) =2910a(18) =1012a(19) =289a(20) =69a(21) =12a(22) =2

External references