A368517 - cp's OEIS frontend

A368517 Irregular triangular array T, read by rows: T(n,k) = number of sums |x-y|+|y-z| = k, where x,y,z are in {1,2,...,n} and x < y.

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

[1, 1, 2, 4, 2, 1, 3, 7, 7, 4, 2, 1, 4, 10, 12, 11, 6, 4, 2, 1, 5, 13, 17, 18, 15, 9, 6, 4, 2, 1, 6, 16, 22, 25, 24, 20, 12, 9, 6, 4, 2, 1, 7, 19, 27, 32, 33, 31, 25, 16, 12, 9, 6, 4, 2, 1, 8, 22, 32, 39, 42, 42, 38, 31, 20, 16, 12, 9, 6, 4, 2, 1, 9, 25, 37]

cp's OEIS Frontend

A368517 Irregular triangular array T, read by rows: T(n,k) = number of sums |x-y|+|y-z| = k, where x,y,z are in {1,2,...,n} and x < y.

Table of values

List of values

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

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

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