A249771 - cp's OEIS frontend

A249771 Irregular triangle read by rows: T(n,k) is the number of Abelian groups of order A025487(n) with k invariant factors (2 <= n, 1 <= k).

n	a(n)
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	2
21	2
22	1
23	1
24	1
25	3
26	1
27	2
28	1
29	1
30	1
31	1
32	1
33	3
34	3
35	2
36	1
37	1
38	1
39	3
40	2
41	1
42	2
43	2
44	1
45	1
46	1
47	1
48	1
49	1
50	3
51	4
52	3
53	2
54	1
55	1
56	1
57	5
58	2
59	2
60	1
61	3
62	1
63	3
64	3
65	2
66	1
67	1
68	1
69	1
70	3
71	5
72	1
73	2

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 1, 3, 3, 2, 1, 1, 1, 3, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 3, 4, 3, 2, 1, 1, 1, 5, 2, 2, 1, 3, 1, 3, 3, 2, 1, 1, 1, 1, 3, 5, 1, 2]

cp's OEIS Frontend

A249771 Irregular triangle read by rows: T(n,k) is the number of Abelian groups of order A025487(n) with k invariant factors (2 <= n, 1 <= k).

Table of values

List of values

n	a(n)
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	2
21	2
22	1
23	1
24	1
25	3
26	1
27	2
28	1
29	1
30	1
31	1
32	1
33	3
34	3
35	2
36	1
37	1
38	1
39	3
40	2
41	1
42	2
43	2
44	1
45	1
46	1
47	1
48	1
49	1
50	3
51	4
52	3
53	2
54	1
55	1
56	1
57	5
58	2
59	2
60	1
61	3
62	1
63	3
64	3
65	2
66	1
67	1
68	1
69	1
70	3
71	5
72	1
73	2

n	a(n)
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	2
21	2
22	1
23	1
24	1
25	3
26	1
27	2
28	1
29	1
30	1
31	1
32	1
33	3
34	3
35	2
36	1
37	1
38	1
39	3
40	2
41	1
42	2
43	2
44	1
45	1
46	1
47	1
48	1
49	1
50	3
51	4
52	3
53	2
54	1
55	1
56	1
57	5
58	2
59	2
60	1
61	3
62	1
63	3
64	3
65	2
66	1
67	1
68	1
69	1
70	3
71	5
72	1
73	2

n	a(n)
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	2
21	2
22	1
23	1
24	1
25	3
26	1
27	2
28	1
29	1
30	1
31	1
32	1
33	3
34	3
35	2
36	1
37	1
38	1
39	3
40	2
41	1
42	2
43	2
44	1
45	1
46	1
47	1
48	1
49	1
50	3
51	4
52	3
53	2
54	1
55	1
56	1
57	5
58	2
59	2
60	1
61	3
62	1
63	3
64	3
65	2
66	1
67	1
68	1
69	1
70	3
71	5
72	1
73	2