Number of tilings of a 24 X n rectangle using 3n octominoes of shape I.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =64a(9) =167a(10) =316a(11) =517a(12) =776a(13) =1099a(14) =1492a(15) =1961a(16) =14428a(17) =39956a(18) =88103a(19) =172509a(20) =311816a(21) =530678a(22) =860861a(23) =1342433a(24) =4020710a(25) =10599604a(26) =24896626a(27) =53438385a(28) =106915866a(29) =202198270