A269699 - cp's OEIS frontend

A269699 Irregular triangle read by rows: T(n, k) is the number of k-element proper ideals of the n-dimensional Boolean lattice, with 0 < k < 2^n.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	3
7	3
8	4
9	3
10	3
11	1
12	1
13	4
14	6
15	10
16	13
17	18
18	19
19	24
20	19
21	18
22	13
23	10
24	6
25	4
26	1
27	1
28	5
29	10
30	20
31	35
32	61
33	95
34	155
35	215
36	310
37	387
38	470
39	530
40	580
41	605
42	621
43	605
44	580
45	530
46	470
47	387
48	310
49	215
50	155
51	95
52	61
53	35
54	20
55	10
56	5
57	1
58	1
59	6
60	15
61	35
62	75
63	156
64	306
65	605
66	1110
67	2045
68	3512
69	5913
70	9415

[1, 1, 2, 1, 1, 3, 3, 4, 3, 3, 1, 1, 4, 6, 10, 13, 18, 19, 24, 19, 18, 13, 10, 6, 4, 1, 1, 5, 10, 20, 35, 61, 95, 155, 215, 310, 387, 470, 530, 580, 605, 621, 605, 580, 530, 470, 387, 310, 215, 155, 95, 61, 35, 20, 10, 5, 1, 1, 6, 15, 35, 75, 156, 306, 605, 1110, 2045, 3512, 5913, 9415]

cp's OEIS Frontend

A269699 Irregular triangle read by rows: T(n, k) is the number of k-element proper ideals of the n-dimensional Boolean lattice, with 0 < k < 2^n.

Table of values

List of values