A347580 - cp's OEIS frontend

A347580 Triangle read by rows: T(n,k) is the number of chains of length k in the poset of all arithmetic progressions contained in {1,...,n} of length in the range [1..n-1], ordered by inclusion.

n	a(n)
1	1
2	1
3	2
4	1
5	6
6	6
7	1
8	12
9	24
10	12
11	1
12	21
13	68
14	72
15	24
16	1
17	32
18	144
19	244
20	180
21	48
22	1
23	47
24	283
25	666
26	764
27	432
28	96
29	1
30	64
31	486
32	1510
33	2436
34	2164
35	1008
36	192
37	1
38	85
39	799
40	3117
41	6534
42	8028
43	5816
44	2304
45	384
46	1
47	109
48	1232
49	5860
50	15368
51	24524
52	24516
53	15040
54	5184
55	768

[1, 1, 2, 1, 6, 6, 1, 12, 24, 12, 1, 21, 68, 72, 24, 1, 32, 144, 244, 180, 48, 1, 47, 283, 666, 764, 432, 96, 1, 64, 486, 1510, 2436, 2164, 1008, 192, 1, 85, 799, 3117, 6534, 8028, 5816, 2304, 384, 1, 109, 1232, 5860, 15368, 24524, 24516, 15040, 5184, 768]

cp's OEIS Frontend

A347580 Triangle read by rows: T(n,k) is the number of chains of length k in the poset of all arithmetic progressions contained in {1,...,n} of length in the range [1..n-1], ordered by inclusion.

Table of values

List of values