A123521 - cp's OEIS frontend

A123521 Triangle read by rows: T(n,k)=number of tilings of a 2 X n grid with k pieces of 1 X 2 tiles (in horizontal position) and 2n-2k pieces of 1 X 1 tiles (0<=k<=n).

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	1
6	4
7	4
8	1
9	6
10	11
11	6
12	1
13	1
14	8
15	22
16	24
17	9
18	1
19	10
20	37
21	62
22	46
23	12
24	1
25	1
26	12
27	56
28	128
29	148
30	80
31	16
32	1
33	14
34	79
35	230
36	367
37	314
38	130
39	20
40	1
41	1
42	16
43	106
44	376
45	771
46	920
47	610
48	200
49	25
50	1
51	18
52	137
53	574
54	1444
55	2232
56	2083
57	1106
58	295
59	30
60	1
61	1
62	20
63	172
64	832
65	2486
66	4744
67	5776
68	4352
69	1897
70	420
71	36

[1, 1, 1, 2, 1, 1, 4, 4, 1, 6, 11, 6, 1, 1, 8, 22, 24, 9, 1, 10, 37, 62, 46, 12, 1, 1, 12, 56, 128, 148, 80, 16, 1, 14, 79, 230, 367, 314, 130, 20, 1, 1, 16, 106, 376, 771, 920, 610, 200, 25, 1, 18, 137, 574, 1444, 2232, 2083, 1106, 295, 30, 1, 1, 20, 172, 832, 2486, 4744, 5776, 4352, 1897, 420, 36]

cp's OEIS Frontend

A123521 Triangle read by rows: T(n,k)=number of tilings of a 2 X n grid with k pieces of 1 X 2 tiles (in horizontal position) and 2n-2k pieces of 1 X 1 tiles (0<=k<=n).

Table of values

List of values