A385859 - cp's OEIS frontend

A385859 a(n) = Sum_{k=0..n} (C(n,k) mod 3)^2.

n	a(n)
0	1
1	2
2	6
3	2
4	4
5	12
6	6
7	12
8	21
9	2
10	4
11	12
12	4
13	8
14	24
15	12
16	24
17	42
18	6
19	12
20	21
21	12
22	24
23	42
24	21
25	42
26	66
27	2
28	4
29	12
30	4
31	8
32	24
33	12
34	24
35	42
36	4
37	8
38	24
39	8
40	16
41	48
42	24
43	48
44	84
45	12
46	24
47	42
48	24
49	48
50	84
51	42
52	84
53	132
54	6
55	12
56	21
57	12
58	24
59	42
60	21
61	42
62	66
63	12
64	24
65	42
66	24
67	48
68	84
69	42

[1, 2, 6, 2, 4, 12, 6, 12, 21, 2, 4, 12, 4, 8, 24, 12, 24, 42, 6, 12, 21, 12, 24, 42, 21, 42, 66, 2, 4, 12, 4, 8, 24, 12, 24, 42, 4, 8, 24, 8, 16, 48, 24, 48, 84, 12, 24, 42, 24, 48, 84, 42, 84, 132, 6, 12, 21, 12, 24, 42, 21, 42, 66, 12, 24, 42, 24, 48, 84, 42]

cp's OEIS Frontend

A385859 a(n) = Sum_{k=0..n} (C(n,k) mod 3)^2.

Table of values

List of values

n	a(n)
0	1
1	2
2	6
3	2
4	4
5	12
6	6
7	12
8	21
9	2
10	4
11	12
12	4
13	8
14	24
15	12
16	24
17	42
18	6
19	12
20	21
21	12
22	24
23	42
24	21
25	42
26	66
27	2
28	4
29	12
30	4
31	8
32	24
33	12
34	24
35	42
36	4
37	8
38	24
39	8
40	16
41	48
42	24
43	48
44	84
45	12
46	24
47	42
48	24
49	48
50	84
51	42
52	84
53	132
54	6
55	12
56	21
57	12
58	24
59	42
60	21
61	42
62	66
63	12
64	24
65	42
66	24
67	48
68	84
69	42

n	a(n)
0	1
1	2
2	6
3	2
4	4
5	12
6	6
7	12
8	21
9	2
10	4
11	12
12	4
13	8
14	24
15	12
16	24
17	42
18	6
19	12
20	21
21	12
22	24
23	42
24	21
25	42
26	66
27	2
28	4
29	12
30	4
31	8
32	24
33	12
34	24
35	42
36	4
37	8
38	24
39	8
40	16
41	48
42	24
43	48
44	84
45	12
46	24
47	42
48	24
49	48
50	84
51	42
52	84
53	132
54	6
55	12
56	21
57	12
58	24
59	42
60	21
61	42
62	66
63	12
64	24
65	42
66	24
67	48
68	84
69	42

n	a(n)
0	1
1	2
2	6
3	2
4	4
5	12
6	6
7	12
8	21
9	2
10	4
11	12
12	4
13	8
14	24
15	12
16	24
17	42
18	6
19	12
20	21
21	12
22	24
23	42
24	21
25	42
26	66
27	2
28	4
29	12
30	4
31	8
32	24
33	12
34	24
35	42
36	4
37	8
38	24
39	8
40	16
41	48
42	24
43	48
44	84
45	12
46	24
47	42
48	24
49	48
50	84
51	42
52	84
53	132
54	6
55	12
56	21
57	12
58	24
59	42
60	21
61	42
62	66
63	12
64	24
65	42
66	24
67	48
68	84
69	42