A238581 - cp's OEIS frontend

A238581 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 9 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=4*floor(n/2), read by rows.

n	a(n)
2	1
3	4
4	12
5	10
6	3
7	1
8	4
9	24
10	40
11	22
12	1
13	8
14	65
15	230
16	467
17	476
18	269
19	70
20	9
21	1
22	8
23	109
24	641
25	2281
26	4424
27	4718
28	2409
29	473
30	1
31	12
32	182
33	1479
34	7644
35	24024
36	47022
37	56226
38	41000
39	17834
40	4545
41	625
42	39
43	1
44	12
45	258
46	2762
47	19347
48	86536
49	255552
50	495547
51	625705
52	499314
53	239254
54	61732
55	6533

[1, 4, 12, 10, 3, 1, 4, 24, 40, 22, 1, 8, 65, 230, 467, 476, 269, 70, 9, 1, 8, 109, 641, 2281, 4424, 4718, 2409, 473, 1, 12, 182, 1479, 7644, 24024, 47022, 56226, 41000, 17834, 4545, 625, 39, 1, 12, 258, 2762, 19347, 86536, 255552, 495547, 625705, 499314, 239254, 61732, 6533]

cp's OEIS Frontend

A238581 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 9 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=4*floor(n/2), read by rows.

Table of values

List of values