A285012 - cp's OEIS frontend

A285012 Irregular triangle read by rows: T(n,k) is the number of periodic palindromic structures of length n using exactly k different symbols, 1 <= k <= n/2 + 1.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	3
11	1
12	1
13	6
14	5
15	1
16	1
17	7
18	6
19	1
20	1
21	13
22	19
23	7
24	1
25	1
26	15
27	25
28	10
29	1
30	1
31	25
32	64
33	43
34	10
35	1
36	1
37	31
38	90
39	65
40	15
41	1
42	1
43	50
44	208
45	220
46	85
47	13
48	1
49	1
50	63
51	301
52	350
53	140
54	21
55	1
56	1
57	99
58	656
59	1059
60	618
61	154
62	17
63	1
64	1
65	127
66	966
67	1701
68	1050
69	266
70	28
71	1

[1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 6, 5, 1, 1, 7, 6, 1, 1, 13, 19, 7, 1, 1, 15, 25, 10, 1, 1, 25, 64, 43, 10, 1, 1, 31, 90, 65, 15, 1, 1, 50, 208, 220, 85, 13, 1, 1, 63, 301, 350, 140, 21, 1, 1, 99, 656, 1059, 618, 154, 17, 1, 1, 127, 966, 1701, 1050, 266, 28, 1]

cp's OEIS Frontend

A285012 Irregular triangle read by rows: T(n,k) is the number of periodic palindromic structures of length n using exactly k different symbols, 1 <= k <= n/2 + 1.

Table of values

List of values