Number of free polyominoes with n cells with at most 4 collinear cell centers on any line in the plane.

A380990

Number of free polyominoes with n cells with at most 4 collinear cell centers on any line in the plane.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =11a(5) =31a(6) =85a(7) =262a(8) =764a(9) =2255a(10) =6341a(11) =17221a(12) =43994a(13) =106205a(14) =239367a(15) =502611a(16) =977791a(17) =1771624a(18) =2989373a(19) =4687803a(20) =6819069a(21) =9234529a(22) =11622453a(23) =13527854a(24) =14571011a(25) =14643347a(26) =13747913a(27) =12041014a(28) =9905945a(29) =7763985

External references