Number of tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

A127864

Number of tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =11a(4) =33a(5) =87a(6) =241a(7) =655a(8) =1793a(9) =4895a(10) =13377a(11) =36543a(12) =99841a(13) =272767a(14) =745217a(15) =2035967a(16) =5562369a(17) =15196671a(18) =41518081a(19) =113429503a(20) =309895169a(21) =846649343a(22) =2313089025a(23) =6319476735a(24) =17265131521a(25) =47169216511a(26) =128868696065a(27) =352075825151a(28) =961889042433

External references