Number of tilings of 4 X 3n rectangle by 1 X 3 rectangles. Rotations and reflections are considered distinct tilings.
A049086
Number of tilings of 4 X 3n rectangle by 1 X 3 rectangles. Rotations and reflections are considered distinct tilings.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =57a(4) =249a(5) =1087a(6) =4745a(7) =20713a(8) =90417a(9) =394691a(10) =1722917a(11) =7520929a(12) =32830585a(13) =143313055a(14) =625594449a(15) =2730863665a(16) =11920848033a(17) =52037243619a(18) =227154537661a(19) =991581805481
External references
- oeis: A049086