A368399 - cp's OEIS frontend

A368399 Irregular triangle read by rows: row n lists the indices of rows of the Christmas tree pattern (A367508) of order n, sorted by row length and, in case of ties, by row index.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	3
9	2
10	4
11	5
12	6
13	1
14	2
15	4
16	5
17	7
18	3
19	6
20	8
21	9
22	10
23	1
24	3
25	7
26	9
27	13
28	2
29	4
30	5
31	8
32	10
33	11
34	14
35	15
36	17
37	6
38	12
39	16
40	18
41	19
42	20
43	1
44	2
45	4
46	5
47	7
48	11
49	12
50	14
51	15
52	17
53	21
54	22
55	24
56	28
57	3
58	6
59	8
60	9
61	13
62	16
63	18
64	19
65	23
66	25
67	26
68	29
69	30
70	32
71	10
72	20
73	27
74	31
75	33
76	34
77	35

[1, 1, 2, 1, 2, 3, 1, 3, 2, 4, 5, 6, 1, 2, 4, 5, 7, 3, 6, 8, 9, 10, 1, 3, 7, 9, 13, 2, 4, 5, 8, 10, 11, 14, 15, 17, 6, 12, 16, 18, 19, 20, 1, 2, 4, 5, 7, 11, 12, 14, 15, 17, 21, 22, 24, 28, 3, 6, 8, 9, 13, 16, 18, 19, 23, 25, 26, 29, 30, 32, 10, 20, 27, 31, 33, 34, 35]

cp's OEIS Frontend

A368399 Irregular triangle read by rows: row n lists the indices of rows of the Christmas tree pattern (A367508) of order n, sorted by row length and, in case of ties, by row index.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	3
9	2
10	4
11	5
12	6
13	1
14	2
15	4
16	5
17	7
18	3
19	6
20	8
21	9
22	10
23	1
24	3
25	7
26	9
27	13
28	2
29	4
30	5
31	8
32	10
33	11
34	14
35	15
36	17
37	6
38	12
39	16
40	18
41	19
42	20
43	1
44	2
45	4
46	5
47	7
48	11
49	12
50	14
51	15
52	17
53	21
54	22
55	24
56	28
57	3
58	6
59	8
60	9
61	13
62	16
63	18
64	19
65	23
66	25
67	26
68	29
69	30
70	32
71	10
72	20
73	27
74	31
75	33
76	34
77	35

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	3
9	2
10	4
11	5
12	6
13	1
14	2
15	4
16	5
17	7
18	3
19	6
20	8
21	9
22	10
23	1
24	3
25	7
26	9
27	13
28	2
29	4
30	5
31	8
32	10
33	11
34	14
35	15
36	17
37	6
38	12
39	16
40	18
41	19
42	20
43	1
44	2
45	4
46	5
47	7
48	11
49	12
50	14
51	15
52	17
53	21
54	22
55	24
56	28
57	3
58	6
59	8
60	9
61	13
62	16
63	18
64	19
65	23
66	25
67	26
68	29
69	30
70	32
71	10
72	20
73	27
74	31
75	33
76	34
77	35

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	3
9	2
10	4
11	5
12	6
13	1
14	2
15	4
16	5
17	7
18	3
19	6
20	8
21	9
22	10
23	1
24	3
25	7
26	9
27	13
28	2
29	4
30	5
31	8
32	10
33	11
34	14
35	15
36	17
37	6
38	12
39	16
40	18
41	19
42	20
43	1
44	2
45	4
46	5
47	7
48	11
49	12
50	14
51	15
52	17
53	21
54	22
55	24
56	28
57	3
58	6
59	8
60	9
61	13
62	16
63	18
64	19
65	23
66	25
67	26
68	29
69	30
70	32
71	10
72	20
73	27
74	31
75	33
76	34
77	35