A127749 - cp's OEIS frontend

A127749 Inverse of number triangle A(n,k) = 1/(2n+1) if k <= n <= 2k, 0 otherwise.

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

[1, 0, 3, 0, -3, 5, 0, 3, -5, 7, 0, 0, 0, -7, 9, 0, -3, 5, 0, -9, 11, 0, 0, 0, 0, 0, -11, 13, 0, 3, -5, 7, 0, 0, -13, 15, 0, 0, 0, 0, 0, 0, 0, -15, 17, 0, 0, 0, -7, 9, 0, 0, 0, -17, 19, 0, 0, 0, 0, 0, 0, 0, 0, 0, -19, 21, 0, -3, 5]

cp's OEIS Frontend

A127749 Inverse of number triangle A(n,k) = 1/(2n+1) if k <= n <= 2k, 0 otherwise.

Table of values

List of values

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

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

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