Number of unrooted hexagonal polyominoes with n cells and no reflections allowed.

A002214

Number of unrooted hexagonal polyominoes with n cells and no reflections allowed.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =7a(4) =18a(5) =64a(6) =226a(7) =856a(8) =3306a(9) =13249a(10) =53794a(11) =222717a(12) =933438a(13) =3960487a(14) =16970362a(15) =73381453a(16) =319817670a(17) =1403875491a(18) =6202064928a(19) =27559699507a(20) =123115236582a(21) =552654175124

External references