A025234 - cp's OEIS frontend

A025234 An L-tile is a 2 X 2 square with the upper 1 X 1 subsquare removed; no rotations are allowed. a(n) = number of tilings of a 4 X n rectangle using tiles that are either 1 X 1 squares or L-tiles.

n	a(n)
0	1
1	0
2	4
3	8
4	28
5	83
6	255
7	778
8	2377
9	7259
10	22173
11	67721
12	206844
13	631764
14	1929609
15	5893632
16	18001012
17	54980764
18	167928588
19	512906847
20	1566579211
21	4784826786
22	14614369465
23	44636891651
24	136335139273
25	416410496177
26	1271848932360
27	3884627600872
28	11864877355729

[1, 0, 4, 8, 28, 83, 255, 778, 2377, 7259, 22173, 67721, 206844, 631764, 1929609, 5893632, 18001012, 54980764, 167928588, 512906847, 1566579211, 4784826786, 14614369465, 44636891651, 136335139273, 416410496177, 1271848932360, 3884627600872, 11864877355729]

cp's OEIS Frontend

A025234 An L-tile is a 2 X 2 square with the upper 1 X 1 subsquare removed; no rotations are allowed. a(n) = number of tilings of a 4 X n rectangle using tiles that are either 1 X 1 squares or L-tiles.

Table of values

List of values