A258579 - cp's OEIS frontend

A258579 Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with (right) waist exactly k.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	3
6	1
7	4
8	7
9	11
10	1
11	8
12	17
13	30
14	48
15	1
16	16
17	43
18	86
19	150
20	241
21	1
22	32
23	113
24	258
25	492
26	846
27	1358
28	1
29	64
30	307
31	806
32	1686
33	3108
34	5276
35	8445
36	1
37	128
38	857
39	2610
40	6012
41	11904
42	21392
43	35904
44	57256
45	1
46	256
47	2443
48	8726
49	22230
50	47376
51	90224
52	158880
53	263976
54	419233

[1, 1, 1, 1, 2, 3, 1, 4, 7, 11, 1, 8, 17, 30, 48, 1, 16, 43, 86, 150, 241, 1, 32, 113, 258, 492, 846, 1358, 1, 64, 307, 806, 1686, 3108, 5276, 8445, 1, 128, 857, 2610, 6012, 11904, 21392, 35904, 57256, 1, 256, 2443, 8726, 22230, 47376, 90224, 158880, 263976, 419233]

cp's OEIS Frontend

A258579 Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with (right) waist exactly k.

Table of values

List of values