Number of tilings of a 12 X n rectangle using 3*n copies of the disconnected shape [o_oo_o].

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =2a(8) =0a(9) =0a(10) =0a(11) =2a(12) =4a(13) =2a(14) =12a(15) =22a(16) =26a(17) =10a(18) =58a(19) =218a(20) =314a(21) =218a(22) =726a(23) =2286a(24) =3434a(25) =2678a(26) =9766a(27) =30962a(28) =45680a(29) =40640