A211509 - cp's OEIS frontend

A211509 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2=2n-x*y.

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

[0, 1, 0, 2, 3, 4, 4, 4, 8, 7, 6, 10, 10, 8, 16, 10, 11, 16, 14, 8, 22, 12, 18, 24, 18, 13, 26, 18, 20, 24, 24, 10, 36, 22, 20, 30, 29, 20, 42, 20, 22, 30, 36, 24, 44, 24, 28, 40, 38, 15, 48, 26, 34, 48, 38, 18, 50, 38, 42, 38, 44, 18, 66, 42, 35, 50, 38, 32, 68, 24, 36]

cp's OEIS Frontend

A211509 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2=2n-x*y.

Table of values

List of values

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

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

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