A309531 - cp's OEIS frontend

A309531 a(n) = Sum_{k=2..n} (-1)^k * A240236(n, k).

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

[1, 1, 0, 0, 2, 2, -3, 1, 5, 5, -2, -2, 4, 10, -6, -6, 1, 1, -8, 0, 10, 10, -16, -8, 4, 18, 7, 7, 13, 13, -19, -7, 9, 19, -11, -11, 7, 21, -15, -15, -5, -5, -20, 10, 32, 32, -36, -24, -1, 17, 0, 0, 18, 32, -14, 6, 34, 34, -23, -23, 7, 45, -29, -13, 5, 5, -16, 8, 30, 30, -66]

cp's OEIS Frontend

A309531 a(n) = Sum_{k=2..n} (-1)^k * A240236(n, k).

Table of values

List of values

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

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

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