Number of achiral polyominoes composed of n pentagonal cells of the hyperbolic regular tiling with Schläfli symbol {5,oo}.

A369472

Number of achiral polyominoes composed of n pentagonal cells of the hyperbolic regular tiling with Schläfli symbol {5,oo}.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =22a(6) =52a(7) =140a(8) =340a(9) =969a(10) =2394a(11) =7084a(12) =17710a(13) =53820a(14) =135720a(15) =420732a(16) =1068012a(17) =3362260a(18) =8579560a(19) =27343888a(20) =70068713a(21) =225568798a(22) =580034052a(23) =1882933364a(24) =4855986044a(25) =15875338990a(26) =41043559340a(27) =134993766600

External references