Number of tilings of a 2 X n rectangle using 2 X 2 and 1 X 1 tiles, right trominoes and dominoes.

A354131

Number of tilings of a 2 X n rectangle using 2 X 2 and 1 X 1 tiles, right trominoes and dominoes.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =48a(4) =216a(5) =936a(6) =4104a(7) =17928a(8) =78408a(9) =342792a(10) =1498824a(11) =6553224a(12) =28652616a(13) =125277192a(14) =547747272a(15) =2394904968a(16) =10471198536a(17) =45783025416a(18) =200176267464a(19) =875226954888

External references