Number of tilings of a 7 X n rectangle using dominoes and straight (3 X 1) trominoes.
A219870
Number of tilings of a 7 X n rectangle using dominoes and straight (3 X 1) trominoes.
Terms
- a(0) =1a(1) =3a(2) =60a(3) =1562a(4) =29907a(5) =707903a(6) =15859323a(7) =354859954a(8) =8061851335a(9) =181382499259
External references
- oeis: A219870