A183158 - cp's OEIS frontend

A183158 T(n,k) is the number of partial isometries of an n-chain of fix k (fix of alpha is the number of fixed points of alpha).

n	a(n)
0	1
1	1
2	1
3	4
4	2
5	1
6	12
7	6
8	3
9	1
10	38
11	10
12	6
13	4
14	1
15	90
16	26
17	10
18	10
19	5
20	1
21	220
22	42
23	15
24	20
25	15
26	6
27	1
28	460
29	106
30	21
31	35
32	35
33	21
34	7
35	1
36	1018
37	170
38	28
39	56
40	70
41	56
42	28
43	8
44	1
45	2022
46	426
47	36
48	84
49	126
50	126
51	84
52	36
53	9
54	1
55	4304
56	682
57	45
58	120
59	210
60	252
61	210
62	120
63	45
64	10
65	1

[1, 1, 1, 4, 2, 1, 12, 6, 3, 1, 38, 10, 6, 4, 1, 90, 26, 10, 10, 5, 1, 220, 42, 15, 20, 15, 6, 1, 460, 106, 21, 35, 35, 21, 7, 1, 1018, 170, 28, 56, 70, 56, 28, 8, 1, 2022, 426, 36, 84, 126, 126, 84, 36, 9, 1, 4304, 682, 45, 120, 210, 252, 210, 120, 45, 10, 1]

cp's OEIS Frontend

A183158 T(n,k) is the number of partial isometries of an n-chain of fix k (fix of alpha is the number of fixed points of alpha).

Table of values

List of values