Number of free poly-IH18-tiles (holes allowed) with n cells.
A197551
Number of free poly-IH18-tiles (holes allowed) with n cells.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =37a(5) =147a(6) =637a(7) =2823a(8) =13020a(9) =60649a(10) =286549a(11) =1364667a(12) =6547108a(13) =31586568
External references
- oeis: A197551