A305621 - cp's OEIS frontend

A305621 Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	3
7	1
8	8
9	18
10	12
11	1
12	18
13	78
14	120
15	60
16	1
17	34
18	273
19	780
20	900
21	360
22	1
23	70
24	921
25	4212
26	8400
27	7560
28	2520
29	1
30	134
31	2916
32	20424
33	63000
34	95760
35	70560
36	20160
37	1
38	270
39	9150
40	93360
41	417120
42	952560
43	1164240
44	725760
45	181440
46	1
47	526
48	28065
49	409380
50	2551560
51	8217720
52	14817600
53	15120000
54	8164800
55	1814400
56	1
57	1054
58	85773
59	1749780
60	14804700
61	64615680
62	161247240
63	239500800
64	209563200
65	99792000
66	19958400

[1, 1, 1, 1, 4, 3, 1, 8, 18, 12, 1, 18, 78, 120, 60, 1, 34, 273, 780, 900, 360, 1, 70, 921, 4212, 8400, 7560, 2520, 1, 134, 2916, 20424, 63000, 95760, 70560, 20160, 1, 270, 9150, 93360, 417120, 952560, 1164240, 725760, 181440, 1, 526, 28065, 409380, 2551560, 8217720, 14817600, 15120000, 8164800, 1814400, 1, 1054, 85773, 1749780, 14804700, 64615680, 161247240, 239500800, 209563200, 99792000, 19958400]

cp's OEIS Frontend

A305621 Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.

Table of values

List of values