Number of tilings of a 9 X n rectangle using integer-sided rectangular tiles of area 9.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =6a(7) =9a(8) =13a(9) =37a(10) =64a(11) =95a(12) =188a(13) =326a(14) =513a(15) =875a(16) =1449a(17) =2302a(18) =4289a(19) =7422a(20) =12072a(21) =21561a(22) =37559a(23) =62571a(24) =107806a(25) =184027a(26) =306628a(27) =532661a(28) =915705a(29) =1537768