The number of tilings of a 3 X n rectangle using integer length rectangles with at least one side of length 1, i.e., tiles are 1 X 1, 1 X 2, ..., 1 X n, 2 X 1, 3 X 1.

A254124

The number of tilings of a 3 X n rectangle using integer length rectangles with at least one side of length 1, i.e., tiles are 1 X 1, 1 X 2, ..., 1 X n, 2 X 1, 3 X 1.

Terms

    a(0) =1a(1) =4a(2) =29a(3) =257a(4) =2408a(5) =22873a(6) =217969a(7) =2078716a(8) =19827701a(9) =189133073a(10) =1804125632a(11) =17209452337a(12) =164160078241

External references