A326882 - cp's OEIS frontend

A326882 Irregular triangle read by rows where T(n,k) is the number of finite topologies with n points and k nonempty open sets, 0 <= k <= 2^n - 1.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	2
6	1
7	0
8	1
9	6
10	9
11	6
12	6
13	0
14	1
15	0
16	1
17	14
18	43
19	60
20	72
21	54
22	54
23	20
24	24
25	0
26	12
27	0
28	0
29	0
30	1
31	0
32	1
33	30
34	165
35	390
36	630
37	780
38	955
39	800
40	900
41	500
42	660
43	240
44	390
45	120
46	190
47	10
48	100
49	0
50	60
51	0
52	0
53	0
54	20
55	0
56	0
57	0
58	0
59	0
60	0
61	0
62	1

[1, 0, 1, 0, 1, 2, 1, 0, 1, 6, 9, 6, 6, 0, 1, 0, 1, 14, 43, 60, 72, 54, 54, 20, 24, 0, 12, 0, 0, 0, 1, 0, 1, 30, 165, 390, 630, 780, 955, 800, 900, 500, 660, 240, 390, 120, 190, 10, 100, 0, 60, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 1]

cp's OEIS Frontend

A326882 Irregular triangle read by rows where T(n,k) is the number of finite topologies with n points and k nonempty open sets, 0 <= k <= 2^n - 1.

Table of values

List of values

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	2
6	1
7	0
8	1
9	6
10	9
11	6
12	6
13	0
14	1
15	0
16	1
17	14
18	43
19	60
20	72
21	54
22	54
23	20
24	24
25	0
26	12
27	0
28	0
29	0
30	1
31	0
32	1
33	30
34	165
35	390
36	630
37	780
38	955
39	800
40	900
41	500
42	660
43	240
44	390
45	120
46	190
47	10
48	100
49	0
50	60
51	0
52	0
53	0
54	20
55	0
56	0
57	0
58	0
59	0
60	0
61	0
62	1

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	2
6	1
7	0
8	1
9	6
10	9
11	6
12	6
13	0
14	1
15	0
16	1
17	14
18	43
19	60
20	72
21	54
22	54
23	20
24	24
25	0
26	12
27	0
28	0
29	0
30	1
31	0
32	1
33	30
34	165
35	390
36	630
37	780
38	955
39	800
40	900
41	500
42	660
43	240
44	390
45	120
46	190
47	10
48	100
49	0
50	60
51	0
52	0
53	0
54	20
55	0
56	0
57	0
58	0
59	0
60	0
61	0
62	1

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	2
6	1
7	0
8	1
9	6
10	9
11	6
12	6
13	0
14	1
15	0
16	1
17	14
18	43
19	60
20	72
21	54
22	54
23	20
24	24
25	0
26	12
27	0
28	0
29	0
30	1
31	0
32	1
33	30
34	165
35	390
36	630
37	780
38	955
39	800
40	900
41	500
42	660
43	240
44	390
45	120
46	190
47	10
48	100
49	0
50	60
51	0
52	0
53	0
54	20
55	0
56	0
57	0
58	0
59	0
60	0
61	0
62	1