A245557 - cp's OEIS frontend

A245557 Irregular triangle read by rows: T(n,k) (n>=0, 0 <= k <= 2n) = number of triples (u,v,w) with entries in the range 0 to n which have some pair adding up to k and in which at least one of u,v,w is equal to n.

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

[1, 3, 6, 4, 3, 6, 15, 12, 7, 3, 6, 9, 24, 21, 18, 10, 3, 6, 9, 12, 33, 30, 27, 24, 13, 3, 6, 9, 12, 15, 42, 39, 36, 33, 30, 16, 3, 6, 9, 12, 15, 18, 51, 48, 45, 42, 39, 36, 19, 3, 6, 9, 12, 15, 18, 21, 60, 57, 54, 51, 48, 45, 42, 22]

cp's OEIS Frontend

A245557 Irregular triangle read by rows: T(n,k) (n>=0, 0 <= k <= 2n) = number of triples (u,v,w) with entries in the range 0 to n which have some pair adding up to k and in which at least one of u,v,w is equal to n.

Table of values

List of values

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

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

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