A012257 - cp's OEIS frontend

A012257 Irregular triangle read by rows: row 0 is {2}; if row n is {r_1, ..., r_k} then row n+1 is {r_k 1's, r_{k-1} 2's, r_{k-2} 3's, etc.}.

n	a(n)
0	2
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	3
12	1
13	1
14	1
15	2
16	2
17	3
18	4
19	1
20	1
21	1
22	1
23	2
24	2
25	2
26	3
27	3
28	4
29	4
30	5
31	6
32	7
33	1
34	1
35	1
36	1
37	1
38	1
39	1
40	2
41	2
42	2
43	2
44	2
45	2
46	3
47	3
48	3
49	3
50	3
51	4
52	4
53	4
54	4
55	5
56	5
57	5
58	5
59	6
60	6
61	6
62	7
63	7
64	7
65	8
66	8
67	9
68	9
69	10
70	10
71	11
72	12
73	13
74	14

[2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 3, 1, 1, 1, 2, 2, 3, 4, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 6, 7, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 13, 14]

cp's OEIS Frontend

A012257 Irregular triangle read by rows: row 0 is {2}; if row n is {r_1, ..., r_k} then row n+1 is {r_k 1's, r_{k-1} 2's, r_{k-2} 3's, etc.}.

Table of values

List of values

n	a(n)
0	2
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	3
12	1
13	1
14	1
15	2
16	2
17	3
18	4
19	1
20	1
21	1
22	1
23	2
24	2
25	2
26	3
27	3
28	4
29	4
30	5
31	6
32	7
33	1
34	1
35	1
36	1
37	1
38	1
39	1
40	2
41	2
42	2
43	2
44	2
45	2
46	3
47	3
48	3
49	3
50	3
51	4
52	4
53	4
54	4
55	5
56	5
57	5
58	5
59	6
60	6
61	6
62	7
63	7
64	7
65	8
66	8
67	9
68	9
69	10
70	10
71	11
72	12
73	13
74	14

n	a(n)
0	2
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	3
12	1
13	1
14	1
15	2
16	2
17	3
18	4
19	1
20	1
21	1
22	1
23	2
24	2
25	2
26	3
27	3
28	4
29	4
30	5
31	6
32	7
33	1
34	1
35	1
36	1
37	1
38	1
39	1
40	2
41	2
42	2
43	2
44	2
45	2
46	3
47	3
48	3
49	3
50	3
51	4
52	4
53	4
54	4
55	5
56	5
57	5
58	5
59	6
60	6
61	6
62	7
63	7
64	7
65	8
66	8
67	9
68	9
69	10
70	10
71	11
72	12
73	13
74	14

n	a(n)
0	2
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	3
12	1
13	1
14	1
15	2
16	2
17	3
18	4
19	1
20	1
21	1
22	1
23	2
24	2
25	2
26	3
27	3
28	4
29	4
30	5
31	6
32	7
33	1
34	1
35	1
36	1
37	1
38	1
39	1
40	2
41	2
42	2
43	2
44	2
45	2
46	3
47	3
48	3
49	3
50	3
51	4
52	4
53	4
54	4
55	5
56	5
57	5
58	5
59	6
60	6
61	6
62	7
63	7
64	7
65	8
66	8
67	9
68	9
69	10
70	10
71	11
72	12
73	13
74	14