A284949 - cp's OEIS frontend

A284949 Triangle read by rows: T(n,k) = number of reversible string structures of length n using exactly k different symbols.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	5
9	4
10	1
11	1
12	9
13	15
14	6
15	1
16	1
17	19
18	50
19	37
20	9
21	1
22	1
23	35
24	160
25	183
26	76
27	12
28	1
29	1
30	71
31	502
32	877
33	542
34	142
35	16
36	1
37	1
38	135
39	1545
40	3930
41	3523
42	1346
43	242
44	20
45	1
46	1
47	271
48	4730
49	17185
50	21393
51	11511
52	2980
53	390
54	25
55	1

[1, 1, 1, 1, 2, 1, 1, 5, 4, 1, 1, 9, 15, 6, 1, 1, 19, 50, 37, 9, 1, 1, 35, 160, 183, 76, 12, 1, 1, 71, 502, 877, 542, 142, 16, 1, 1, 135, 1545, 3930, 3523, 1346, 242, 20, 1, 1, 271, 4730, 17185, 21393, 11511, 2980, 390, 25, 1]

cp's OEIS Frontend

A284949 Triangle read by rows: T(n,k) = number of reversible string structures of length n using exactly k different symbols.

Table of values

List of values