A293181 - cp's OEIS frontend

A293181 Irregular triangle read by rows: T(n,k) is the number of k-partitions of {1..2n} that are invariant under a permutation consisting of n 2-cycles (1 <= k <= 2n).

n	a(n)
1	1
2	1
3	1
4	3
5	2
6	1
7	1
8	7
9	10
10	9
11	3
12	1
13	1
14	15
15	38
16	53
17	34
18	18
19	4
20	1
21	1
22	31
23	130
24	265
25	261
26	195
27	80
28	30
29	5
30	1
31	1
32	63
33	422
34	1221
35	1700
36	1696
37	1016
38	515
39	155
40	45
41	6
42	1
43	1
44	127
45	1330
46	5369
47	10143
48	13097
49	10508
50	6832
51	2926
52	1120
53	266
54	63
55	7
56	1

[1, 1, 1, 3, 2, 1, 1, 7, 10, 9, 3, 1, 1, 15, 38, 53, 34, 18, 4, 1, 1, 31, 130, 265, 261, 195, 80, 30, 5, 1, 1, 63, 422, 1221, 1700, 1696, 1016, 515, 155, 45, 6, 1, 1, 127, 1330, 5369, 10143, 13097, 10508, 6832, 2926, 1120, 266, 63, 7, 1]

cp's OEIS Frontend

A293181 Irregular triangle read by rows: T(n,k) is the number of k-partitions of {1..2n} that are invariant under a permutation consisting of n 2-cycles (1 <= k <= 2n).

Table of values

List of values