Number of strip poly-IH64-tiles (holes allowed) with n cells.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =19a(5) =43a(6) =103a(7) =239a(8) =569a(9) =1339a(10) =3185a(11) =7503a(12) =17794a(13) =41908a(14) =99137a(15) =233251a(16) =550624a(17) =1294032a(18) =3049412a(19) =7158698a(20) =16844717a(21) =39505579a(22) =92841149