Number of board-pair-pile hexagonal polyominoes with n cells.

A068091

Number of board-pair-pile hexagonal polyominoes with n cells.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =44a(4) =186a(5) =814a(6) =3648a(7) =16611a(8) =76437a(9) =354112a(10) =1647344a(11) =7682237a(12) =35873310a(13) =167625690a(14) =783470179a(15) =3662035980a(16) =17115684065a(17) =79986841677a(18) =373759118882

External references