A245556 - cp's OEIS frontend

A245556 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.

n	a(n)
0	1
1	4
2	6
3	4
4	7
5	12
6	19
7	12
8	7
9	10
10	18
11	28
12	36
13	28
14	18
15	10
16	13
17	24
18	37
19	48
20	61
21	48
22	37
23	24
24	13
25	16
26	30
27	46
28	60
29	76
30	90
31	76
32	60
33	46
34	30
35	16
36	19
37	36
38	55
39	72
40	91
41	108
42	127
43	108
44	91
45	72
46	55
47	36
48	19
49	22
50	42
51	64
52	84
53	106
54	126
55	148
56	168
57	148
58	126
59	106
60	84
61	64
62	42
63	22

[1, 4, 6, 4, 7, 12, 19, 12, 7, 10, 18, 28, 36, 28, 18, 10, 13, 24, 37, 48, 61, 48, 37, 24, 13, 16, 30, 46, 60, 76, 90, 76, 60, 46, 30, 16, 19, 36, 55, 72, 91, 108, 127, 108, 91, 72, 55, 36, 19, 22, 42, 64, 84, 106, 126, 148, 168, 148, 126, 106, 84, 64, 42, 22]

cp's OEIS Frontend

A245556 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.

Table of values

List of values

n	a(n)
0	1
1	4
2	6
3	4
4	7
5	12
6	19
7	12
8	7
9	10
10	18
11	28
12	36
13	28
14	18
15	10
16	13
17	24
18	37
19	48
20	61
21	48
22	37
23	24
24	13
25	16
26	30
27	46
28	60
29	76
30	90
31	76
32	60
33	46
34	30
35	16
36	19
37	36
38	55
39	72
40	91
41	108
42	127
43	108
44	91
45	72
46	55
47	36
48	19
49	22
50	42
51	64
52	84
53	106
54	126
55	148
56	168
57	148
58	126
59	106
60	84
61	64
62	42
63	22

n	a(n)
0	1
1	4
2	6
3	4
4	7
5	12
6	19
7	12
8	7
9	10
10	18
11	28
12	36
13	28
14	18
15	10
16	13
17	24
18	37
19	48
20	61
21	48
22	37
23	24
24	13
25	16
26	30
27	46
28	60
29	76
30	90
31	76
32	60
33	46
34	30
35	16
36	19
37	36
38	55
39	72
40	91
41	108
42	127
43	108
44	91
45	72
46	55
47	36
48	19
49	22
50	42
51	64
52	84
53	106
54	126
55	148
56	168
57	148
58	126
59	106
60	84
61	64
62	42
63	22

n	a(n)
0	1
1	4
2	6
3	4
4	7
5	12
6	19
7	12
8	7
9	10
10	18
11	28
12	36
13	28
14	18
15	10
16	13
17	24
18	37
19	48
20	61
21	48
22	37
23	24
24	13
25	16
26	30
27	46
28	60
29	76
30	90
31	76
32	60
33	46
34	30
35	16
36	19
37	36
38	55
39	72
40	91
41	108
42	127
43	108
44	91
45	72
46	55
47	36
48	19
49	22
50	42
51	64
52	84
53	106
54	126
55	148
56	168
57	148
58	126
59	106
60	84
61	64
62	42
63	22