A231145 - cp's OEIS frontend

A231145 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 5 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=n-n%2, read by rows.

n	a(n)
2	1
3	2
4	2
5	1
6	2
7	4
8	1
9	4
10	13
11	10
12	4
13	1
14	4
15	23
16	35
17	23
18	1
19	6
20	40
21	101
22	125
23	54
24	10
25	1
26	6
27	58
28	206
29	403
30	336
31	106
32	1
33	8
34	83
35	392
36	1056
37	1438
38	956
39	240
40	25
41	1
42	8
43	109
44	641
45	2281
46	4424
47	4718
48	2409
49	473
50	1
51	10
52	142
53	1011
54	4429
55	11370
56	17252
57	14478
58	6094
59	1020
60	70

[1, 2, 2, 1, 2, 4, 1, 4, 13, 10, 4, 1, 4, 23, 35, 23, 1, 6, 40, 101, 125, 54, 10, 1, 6, 58, 206, 403, 336, 106, 1, 8, 83, 392, 1056, 1438, 956, 240, 25, 1, 8, 109, 641, 2281, 4424, 4718, 2409, 473, 1, 10, 142, 1011, 4429, 11370, 17252, 14478, 6094, 1020, 70]

cp's OEIS Frontend

A231145 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 5 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=n-n%2, read by rows.

Table of values

List of values