A214630 - cp's OEIS frontend

A214630 a(n) is the reduced numerator of 1/4 - 1/A109043(n)^2 = (1 - 1/A026741(n)^2)/4.

n	a(n)
0	-1
1	0
2	0
3	2
4	3
5	6
6	2
7	12
8	15
9	20
10	6
11	30
12	35
13	42
14	12
15	56
16	63
17	72
18	20
19	90
20	99
21	110
22	30
23	132
24	143
25	156
26	42
27	182
28	195
29	210
30	56
31	240
32	255
33	272
34	72
35	306
36	323
37	342
38	90
39	380
40	399
41	420
42	110
43	462
44	483
45	506
46	132
47	552
48	575
49	600
50	156

[-1, 0, 0, 2, 3, 6, 2, 12, 15, 20, 6, 30, 35, 42, 12, 56, 63, 72, 20, 90, 99, 110, 30, 132, 143, 156, 42, 182, 195, 210, 56, 240, 255, 272, 72, 306, 323, 342, 90, 380, 399, 420, 110, 462, 483, 506, 132, 552, 575, 600, 156]

cp's OEIS Frontend

A214630 a(n) is the reduced numerator of 1/4 - 1/A109043(n)^2 = (1 - 1/A026741(n)^2)/4.

Table of values

List of values

n	a(n)
0	-1
1	0
2	0
3	2
4	3
5	6
6	2
7	12
8	15
9	20
10	6
11	30
12	35
13	42
14	12
15	56
16	63
17	72
18	20
19	90
20	99
21	110
22	30
23	132
24	143
25	156
26	42
27	182
28	195
29	210
30	56
31	240
32	255
33	272
34	72
35	306
36	323
37	342
38	90
39	380
40	399
41	420
42	110
43	462
44	483
45	506
46	132
47	552
48	575
49	600
50	156

n	a(n)
0	-1
1	0
2	0
3	2
4	3
5	6
6	2
7	12
8	15
9	20
10	6
11	30
12	35
13	42
14	12
15	56
16	63
17	72
18	20
19	90
20	99
21	110
22	30
23	132
24	143
25	156
26	42
27	182
28	195
29	210
30	56
31	240
32	255
33	272
34	72
35	306
36	323
37	342
38	90
39	380
40	399
41	420
42	110
43	462
44	483
45	506
46	132
47	552
48	575
49	600
50	156

n	a(n)
0	-1
1	0
2	0
3	2
4	3
5	6
6	2
7	12
8	15
9	20
10	6
11	30
12	35
13	42
14	12
15	56
16	63
17	72
18	20
19	90
20	99
21	110
22	30
23	132
24	143
25	156
26	42
27	182
28	195
29	210
30	56
31	240
32	255
33	272
34	72
35	306
36	323
37	342
38	90
39	380
40	399
41	420
42	110
43	462
44	483
45	506
46	132
47	552
48	575
49	600
50	156