Number of free poly-IH9-tiles (holes allowed) with n cells.
A213950
Number of free poly-IH9-tiles (holes allowed) with n cells.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =99a(5) =416a(6) =1852a(7) =8386a(8) =38798a(9) =181531a(10) =858570a(11) =4092042a(12) =19636172a(13) =94750922
External references
- oeis: A213950