Number of 2 X 2 tiles in all tilings of a 4 X n rectangle with 1 X 1 and 2 X 2 square tiles.
A128102
Number of 2 X 2 tiles in all tilings of a 4 X n rectangle with 1 X 1 and 2 X 2 square tiles.
Terms
- a(0) =0a(1) =0a(2) =5a(3) =14a(4) =69a(5) =224a(6) =805a(7) =2610a(8) =8545a(9) =27068a(10) =85209a(11) =264406a(12) =814509a(13) =2488536a(14) =7558093a(15) =22827130a(16) =68625657a(17) =205455348a(18) =612884929a(19) =1822355742a(20) =5402974789a(21) =15977195792a(22) =47135117493a(23) =138757706946a(24) =407679684497
External references
- oeis: A128102