A373398 - cp's OEIS frontend

A373398 Triangle read by rows: T(n, k) = number of k-element subobjects of an n-element set in the category of relations, n >= 0, 0 <= k <= n.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	7
8	9
9	1
10	1
11	15
12	55
13	25
14	1
15	1
16	31
17	285
18	395
19	65
20	1
21	1
22	63
23	1351
24	5045
25	2555
26	161
27	1
28	1
29	127
30	6069
31	56931
32	78685
33	15211
34	385
35	1
36	1
37	255
38	26335
39	592725
40	2091171
41	1101021
42	85099
43	897
44	1
45	1
46	511
47	111645
48	5834515
49	50334765
50	67590387
51	14169405
52	454315
53	2049
54	1

[1, 1, 1, 1, 3, 1, 1, 7, 9, 1, 1, 15, 55, 25, 1, 1, 31, 285, 395, 65, 1, 1, 63, 1351, 5045, 2555, 161, 1, 1, 127, 6069, 56931, 78685, 15211, 385, 1, 1, 255, 26335, 592725, 2091171, 1101021, 85099, 897, 1, 1, 511, 111645, 5834515, 50334765, 67590387, 14169405, 454315, 2049, 1]

cp's OEIS Frontend

A373398 Triangle read by rows: T(n, k) = number of k-element subobjects of an n-element set in the category of relations, n >= 0, 0 <= k <= n.

Table of values

List of values