A127830 - cp's OEIS frontend

A127830 a(n) = Sum_{k=0..n} (binomial(floor(k/2),n-k) mod 2).

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	2
14	3
15	5
16	5
17	4
18	4
19	5
20	4
21	3
22	3
23	3
24	4
25	4
26	3
27	4
28	5
29	3
30	5
31	8
32	8
33	7
34	6
35	7
36	7
37	5
38	6
39	8
40	7
41	6
42	5
43	5
44	5
45	4
46	4
47	5
48	6
49	5
50	5
51	7
52	6
53	4
54	5
55	6
56	7
57	7
58	5
59	6
60	8
61	5
62	8
63	13
64	13
65	11
66	10
67	12
68	11
69	8
70	9
71	11
72	11
73	10
74	8
75	9
76	10
77	7
78	9
79	13
80	12

[1, 1, 1, 2, 2, 1, 2, 3, 3, 3, 2, 2, 3, 2, 3, 5, 5, 4, 4, 5, 4, 3, 3, 3, 4, 4, 3, 4, 5, 3, 5, 8, 8, 7, 6, 7, 7, 5, 6, 8, 7, 6, 5, 5, 5, 4, 4, 5, 6, 5, 5, 7, 6, 4, 5, 6, 7, 7, 5, 6, 8, 5, 8, 13, 13, 11, 10, 12, 11, 8, 9, 11, 11, 10, 8, 9, 10, 7, 9, 13, 12]

cp's OEIS Frontend

A127830 a(n) = Sum_{k=0..n} (binomial(floor(k/2),n-k) mod 2).

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	2
14	3
15	5
16	5
17	4
18	4
19	5
20	4
21	3
22	3
23	3
24	4
25	4
26	3
27	4
28	5
29	3
30	5
31	8
32	8
33	7
34	6
35	7
36	7
37	5
38	6
39	8
40	7
41	6
42	5
43	5
44	5
45	4
46	4
47	5
48	6
49	5
50	5
51	7
52	6
53	4
54	5
55	6
56	7
57	7
58	5
59	6
60	8
61	5
62	8
63	13
64	13
65	11
66	10
67	12
68	11
69	8
70	9
71	11
72	11
73	10
74	8
75	9
76	10
77	7
78	9
79	13
80	12

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	2
14	3
15	5
16	5
17	4
18	4
19	5
20	4
21	3
22	3
23	3
24	4
25	4
26	3
27	4
28	5
29	3
30	5
31	8
32	8
33	7
34	6
35	7
36	7
37	5
38	6
39	8
40	7
41	6
42	5
43	5
44	5
45	4
46	4
47	5
48	6
49	5
50	5
51	7
52	6
53	4
54	5
55	6
56	7
57	7
58	5
59	6
60	8
61	5
62	8
63	13
64	13
65	11
66	10
67	12
68	11
69	8
70	9
71	11
72	11
73	10
74	8
75	9
76	10
77	7
78	9
79	13
80	12

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	2
7	3
8	3
9	3
10	2
11	2
12	3
13	2
14	3
15	5
16	5
17	4
18	4
19	5
20	4
21	3
22	3
23	3
24	4
25	4
26	3
27	4
28	5
29	3
30	5
31	8
32	8
33	7
34	6
35	7
36	7
37	5
38	6
39	8
40	7
41	6
42	5
43	5
44	5
45	4
46	4
47	5
48	6
49	5
50	5
51	7
52	6
53	4
54	5
55	6
56	7
57	7
58	5
59	6
60	8
61	5
62	8
63	13
64	13
65	11
66	10
67	12
68	11
69	8
70	9
71	11
72	11
73	10
74	8
75	9
76	10
77	7
78	9
79	13
80	12