A102899 - cp's OEIS frontend

A102899 a(n) = ceiling(n/3)^2 - floor(n/3)^2.

n	a(n)
0	0
1	1
2	1
3	0
4	3
5	3
6	0
7	5
8	5
9	0
10	7
11	7
12	0
13	9
14	9
15	0
16	11
17	11
18	0
19	13
20	13
21	0
22	15
23	15
24	0
25	17
26	17
27	0
28	19
29	19
30	0
31	21
32	21
33	0
34	23
35	23
36	0
37	25
38	25
39	0
40	27
41	27
42	0
43	29
44	29
45	0
46	31
47	31
48	0
49	33
50	33
51	0
52	35
53	35
54	0
55	37
56	37
57	0
58	39
59	39
60	0
61	41
62	41
63	0
64	43
65	43
66	0
67	45
68	45
69	0
70	47
71	47
72	0
73	49
74	49
75	0
76	51
77	51
78	0
79	53
80	53
81	0

[0, 1, 1, 0, 3, 3, 0, 5, 5, 0, 7, 7, 0, 9, 9, 0, 11, 11, 0, 13, 13, 0, 15, 15, 0, 17, 17, 0, 19, 19, 0, 21, 21, 0, 23, 23, 0, 25, 25, 0, 27, 27, 0, 29, 29, 0, 31, 31, 0, 33, 33, 0, 35, 35, 0, 37, 37, 0, 39, 39, 0, 41, 41, 0, 43, 43, 0, 45, 45, 0, 47, 47, 0, 49, 49, 0, 51, 51, 0, 53, 53, 0]

cp's OEIS Frontend

A102899 a(n) = ceiling(n/3)^2 - floor(n/3)^2.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	0
4	3
5	3
6	0
7	5
8	5
9	0
10	7
11	7
12	0
13	9
14	9
15	0
16	11
17	11
18	0
19	13
20	13
21	0
22	15
23	15
24	0
25	17
26	17
27	0
28	19
29	19
30	0
31	21
32	21
33	0
34	23
35	23
36	0
37	25
38	25
39	0
40	27
41	27
42	0
43	29
44	29
45	0
46	31
47	31
48	0
49	33
50	33
51	0
52	35
53	35
54	0
55	37
56	37
57	0
58	39
59	39
60	0
61	41
62	41
63	0
64	43
65	43
66	0
67	45
68	45
69	0
70	47
71	47
72	0
73	49
74	49
75	0
76	51
77	51
78	0
79	53
80	53
81	0

n	a(n)
0	0
1	1
2	1
3	0
4	3
5	3
6	0
7	5
8	5
9	0
10	7
11	7
12	0
13	9
14	9
15	0
16	11
17	11
18	0
19	13
20	13
21	0
22	15
23	15
24	0
25	17
26	17
27	0
28	19
29	19
30	0
31	21
32	21
33	0
34	23
35	23
36	0
37	25
38	25
39	0
40	27
41	27
42	0
43	29
44	29
45	0
46	31
47	31
48	0
49	33
50	33
51	0
52	35
53	35
54	0
55	37
56	37
57	0
58	39
59	39
60	0
61	41
62	41
63	0
64	43
65	43
66	0
67	45
68	45
69	0
70	47
71	47
72	0
73	49
74	49
75	0
76	51
77	51
78	0
79	53
80	53
81	0

n	a(n)
0	0
1	1
2	1
3	0
4	3
5	3
6	0
7	5
8	5
9	0
10	7
11	7
12	0
13	9
14	9
15	0
16	11
17	11
18	0
19	13
20	13
21	0
22	15
23	15
24	0
25	17
26	17
27	0
28	19
29	19
30	0
31	21
32	21
33	0
34	23
35	23
36	0
37	25
38	25
39	0
40	27
41	27
42	0
43	29
44	29
45	0
46	31
47	31
48	0
49	33
50	33
51	0
52	35
53	35
54	0
55	37
56	37
57	0
58	39
59	39
60	0
61	41
62	41
63	0
64	43
65	43
66	0
67	45
68	45
69	0
70	47
71	47
72	0
73	49
74	49
75	0
76	51
77	51
78	0
79	53
80	53
81	0