A213786 - cp's OEIS frontend

A213786 a(n) = Sum_{1<=i b(i)*b(j), where b(k) = A020985(k).

n	a(n)
0	0
1	0
2	1
3	-1
4	0
5	2
6	-1
7	1
8	4
9	8
10	13
11	7
12	2
13	-2
14	1
15	-3
16	0
17	4
18	9
19	3
20	8
21	14
22	7
23	13
24	6
25	0
26	-5
27	-1
28	4
29	10
30	3
31	9
32	16
33	24
34	33
35	23
36	32
37	42
38	31
39	41
40	52
41	64
42	77
43	63
44	50
45	38
46	49
47	37
48	26
49	16
50	7
51	15
52	6
53	-2
54	5
55	-3
56	4
57	12
58	21
59	11
60	2
61	-6
62	1
63	-7
64	0
65	8
66	17
67	7
68	16
69	26
70	15
71	25
72	36

[0, 0, 1, -1, 0, 2, -1, 1, 4, 8, 13, 7, 2, -2, 1, -3, 0, 4, 9, 3, 8, 14, 7, 13, 6, 0, -5, -1, 4, 10, 3, 9, 16, 24, 33, 23, 32, 42, 31, 41, 52, 64, 77, 63, 50, 38, 49, 37, 26, 16, 7, 15, 6, -2, 5, -3, 4, 12, 21, 11, 2, -6, 1, -7, 0, 8, 17, 7, 16, 26, 15, 25, 36]

cp's OEIS Frontend

A213786 a(n) = Sum_{1<=i b(i)*b(j), where b(k) = A020985(k).

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	-1
4	0
5	2
6	-1
7	1
8	4
9	8
10	13
11	7
12	2
13	-2
14	1
15	-3
16	0
17	4
18	9
19	3
20	8
21	14
22	7
23	13
24	6
25	0
26	-5
27	-1
28	4
29	10
30	3
31	9
32	16
33	24
34	33
35	23
36	32
37	42
38	31
39	41
40	52
41	64
42	77
43	63
44	50
45	38
46	49
47	37
48	26
49	16
50	7
51	15
52	6
53	-2
54	5
55	-3
56	4
57	12
58	21
59	11
60	2
61	-6
62	1
63	-7
64	0
65	8
66	17
67	7
68	16
69	26
70	15
71	25
72	36

n	a(n)
0	0
1	0
2	1
3	-1
4	0
5	2
6	-1
7	1
8	4
9	8
10	13
11	7
12	2
13	-2
14	1
15	-3
16	0
17	4
18	9
19	3
20	8
21	14
22	7
23	13
24	6
25	0
26	-5
27	-1
28	4
29	10
30	3
31	9
32	16
33	24
34	33
35	23
36	32
37	42
38	31
39	41
40	52
41	64
42	77
43	63
44	50
45	38
46	49
47	37
48	26
49	16
50	7
51	15
52	6
53	-2
54	5
55	-3
56	4
57	12
58	21
59	11
60	2
61	-6
62	1
63	-7
64	0
65	8
66	17
67	7
68	16
69	26
70	15
71	25
72	36

n	a(n)
0	0
1	0
2	1
3	-1
4	0
5	2
6	-1
7	1
8	4
9	8
10	13
11	7
12	2
13	-2
14	1
15	-3
16	0
17	4
18	9
19	3
20	8
21	14
22	7
23	13
24	6
25	0
26	-5
27	-1
28	4
29	10
30	3
31	9
32	16
33	24
34	33
35	23
36	32
37	42
38	31
39	41
40	52
41	64
42	77
43	63
44	50
45	38
46	49
47	37
48	26
49	16
50	7
51	15
52	6
53	-2
54	5
55	-3
56	4
57	12
58	21
59	11
60	2
61	-6
62	1
63	-7
64	0
65	8
66	17
67	7
68	16
69	26
70	15
71	25
72	36