A327873 - cp's OEIS frontend

A327873 Irregular triangle read by rows: T(n,k) is the number of length n primitive (aperiodic) palindromes using exactly k different symbols, 1 <= k <= ceiling(n/2).

n	a(n)
1	1
2	0
3	0
4	2
5	0
6	2
7	0
8	6
9	6
10	0
11	4
12	6
13	0
14	14
15	36
16	24
17	0
18	12
19	36
20	24
21	0
22	28
23	150
24	240
25	120
26	0
27	24
28	144
29	240
30	120
31	0
32	62
33	540
34	1560
35	1800
36	720
37	0
38	54
39	534
40	1560
41	1800
42	720
43	0
44	126
45	1806
46	8400
47	16800
48	15120
49	5040
50	0
51	112
52	1770
53	8376
54	16800
55	15120
56	5040

[1, 0, 0, 2, 0, 2, 0, 6, 6, 0, 4, 6, 0, 14, 36, 24, 0, 12, 36, 24, 0, 28, 150, 240, 120, 0, 24, 144, 240, 120, 0, 62, 540, 1560, 1800, 720, 0, 54, 534, 1560, 1800, 720, 0, 126, 1806, 8400, 16800, 15120, 5040, 0, 112, 1770, 8376, 16800, 15120, 5040]

cp's OEIS Frontend

A327873 Irregular triangle read by rows: T(n,k) is the number of length n primitive (aperiodic) palindromes using exactly k different symbols, 1 <= k <= ceiling(n/2).

Table of values

List of values