Number of tilings of a 12 X n rectangle using 2*n copies of the disconnected shape [ooo___ooo].

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =6a(10) =13a(11) =22a(12) =64a(13) =114a(14) =172a(15) =242a(16) =320a(17) =406a(18) =561a(19) =811a(20) =1188a(21) =2204a(22) =4093a(23) =7181a(24) =13185a(25) =22687a(26) =36597a(27) =56934a(28) =85897a(29) =126485