A076118 - cp's OEIS frontend

A076118 a(n) = Sum_{k=n/2..n} k * (-1)^(n-k) * C(k,n-k).

n	a(n)
0	0
1	1
2	1
3	-1
4	-3
5	-2
6	2
7	5
8	3
9	-3
10	-7
11	-4
12	4
13	9
14	5
15	-5
16	-11
17	-6
18	6
19	13
20	7
21	-7
22	-15
23	-8
24	8
25	17
26	9
27	-9
28	-19
29	-10
30	10
31	21
32	11
33	-11
34	-23
35	-12
36	12
37	25
38	13
39	-13
40	-27
41	-14
42	14
43	29
44	15
45	-15
46	-31
47	-16
48	16
49	33
50	17
51	-17
52	-35
53	-18
54	18
55	37
56	19
57	-19
58	-39
59	-20
60	20
61	41
62	21
63	-21
64	-43
65	-22
66	22
67	45
68	23
69	-23
70	-47
71	-24
72	24
73	49
74	25
75	-25
76	-51
77	-26
78	26

[0, 1, 1, -1, -3, -2, 2, 5, 3, -3, -7, -4, 4, 9, 5, -5, -11, -6, 6, 13, 7, -7, -15, -8, 8, 17, 9, -9, -19, -10, 10, 21, 11, -11, -23, -12, 12, 25, 13, -13, -27, -14, 14, 29, 15, -15, -31, -16, 16, 33, 17, -17, -35, -18, 18, 37, 19, -19, -39, -20, 20, 41, 21, -21, -43, -22, 22, 45, 23, -23, -47, -24, 24, 49, 25, -25, -51, -26, 26]

cp's OEIS Frontend

A076118 a(n) = Sum_{k=n/2..n} k * (-1)^(n-k) * C(k,n-k).

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	-1
4	-3
5	-2
6	2
7	5
8	3
9	-3
10	-7
11	-4
12	4
13	9
14	5
15	-5
16	-11
17	-6
18	6
19	13
20	7
21	-7
22	-15
23	-8
24	8
25	17
26	9
27	-9
28	-19
29	-10
30	10
31	21
32	11
33	-11
34	-23
35	-12
36	12
37	25
38	13
39	-13
40	-27
41	-14
42	14
43	29
44	15
45	-15
46	-31
47	-16
48	16
49	33
50	17
51	-17
52	-35
53	-18
54	18
55	37
56	19
57	-19
58	-39
59	-20
60	20
61	41
62	21
63	-21
64	-43
65	-22
66	22
67	45
68	23
69	-23
70	-47
71	-24
72	24
73	49
74	25
75	-25
76	-51
77	-26
78	26

n	a(n)
0	0
1	1
2	1
3	-1
4	-3
5	-2
6	2
7	5
8	3
9	-3
10	-7
11	-4
12	4
13	9
14	5
15	-5
16	-11
17	-6
18	6
19	13
20	7
21	-7
22	-15
23	-8
24	8
25	17
26	9
27	-9
28	-19
29	-10
30	10
31	21
32	11
33	-11
34	-23
35	-12
36	12
37	25
38	13
39	-13
40	-27
41	-14
42	14
43	29
44	15
45	-15
46	-31
47	-16
48	16
49	33
50	17
51	-17
52	-35
53	-18
54	18
55	37
56	19
57	-19
58	-39
59	-20
60	20
61	41
62	21
63	-21
64	-43
65	-22
66	22
67	45
68	23
69	-23
70	-47
71	-24
72	24
73	49
74	25
75	-25
76	-51
77	-26
78	26

n	a(n)
0	0
1	1
2	1
3	-1
4	-3
5	-2
6	2
7	5
8	3
9	-3
10	-7
11	-4
12	4
13	9
14	5
15	-5
16	-11
17	-6
18	6
19	13
20	7
21	-7
22	-15
23	-8
24	8
25	17
26	9
27	-9
28	-19
29	-10
30	10
31	21
32	11
33	-11
34	-23
35	-12
36	12
37	25
38	13
39	-13
40	-27
41	-14
42	14
43	29
44	15
45	-15
46	-31
47	-16
48	16
49	33
50	17
51	-17
52	-35
53	-18
54	18
55	37
56	19
57	-19
58	-39
59	-20
60	20
61	41
62	21
63	-21
64	-43
65	-22
66	22
67	45
68	23
69	-23
70	-47
71	-24
72	24
73	49
74	25
75	-25
76	-51
77	-26
78	26