Number of n-celled polyhexes (hexagonal polyominoes) without bilateral symmetry.

A030226

Number of n-celled polyhexes (hexagonal polyominoes) without bilateral symmetry.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =11a(5) =65a(6) =287a(7) =1373a(8) =6370a(9) =30149a(10) =142638a(11) =681520a(12) =3270604a(13) =15789461a(14) =76562081a(15) =372832744a(16) =1822142769a(17) =8934740804a(18) =43938715224a(19) =216650217219

External references