A060550 - cp's OEIS frontend

A060550 a(n) is the number of distinct patterns (modulo geometric D_3-operations) with no other than strict 120-degree rotational symmetry which can be formed by an equilateral triangular arrangement of closely packed black and white cells satisfying the local matching rule of Pascal's triangle modulo 2, where n is the number of cells in each edge of the arrangement.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	2
10	6
11	2
12	6
13	12
14	6
15	12
16	28
17	12
18	28
19	56
20	28
21	56
22	120
23	56
24	120
25	240
26	120
27	240
28	496
29	240
30	496
31	992
32	496
33	992
34	2016
35	992
36	2016
37	4032
38	2016
39	4032
40	8128
41	4032
42	8128
43	16256
44	8128
45	16256
46	32640
47	16256
48	32640
49	65280
50	32640

[0, 0, 0, 1, 0, 1, 2, 1, 2, 6, 2, 6, 12, 6, 12, 28, 12, 28, 56, 28, 56, 120, 56, 120, 240, 120, 240, 496, 240, 496, 992, 496, 992, 2016, 992, 2016, 4032, 2016, 4032, 8128, 4032, 8128, 16256, 8128, 16256, 32640, 16256, 32640, 65280, 32640]

cp's OEIS Frontend

Table of values

List of values