A134661 - cp's OEIS frontend

A134661 Number of odd coefficients in (1 + x + x^3)^n.

n	a(n)
0	1
1	3
2	3
3	7
4	3
5	9
6	7
7	13
8	3
9	9
10	9
11	19
12	7
13	21
14	13
15	27
16	3
17	9
18	9
19	21
20	9
21	27
22	19
23	35
24	7
25	21
26	21
27	41
28	13
29	39
30	27
31	55
32	3
33	9
34	9
35	21
36	9
37	27
38	21
39	39
40	9
41	27
42	27
43	55
44	19
45	57
46	35
47	73
48	7
49	21
50	21
51	49
52	21
53	63
54	41
55	75
56	13
57	39
58	39
59	79
60	27
61	81
62	55
63	109
64	3
65	9
66	9
67	21
68	9
69	27
70	21
71	39
72	9
73	27
74	27
75	57
76	21
77	63
78	39

[1, 3, 3, 7, 3, 9, 7, 13, 3, 9, 9, 19, 7, 21, 13, 27, 3, 9, 9, 21, 9, 27, 19, 35, 7, 21, 21, 41, 13, 39, 27, 55, 3, 9, 9, 21, 9, 27, 21, 39, 9, 27, 27, 55, 19, 57, 35, 73, 7, 21, 21, 49, 21, 63, 41, 75, 13, 39, 39, 79, 27, 81, 55, 109, 3, 9, 9, 21, 9, 27, 21, 39, 9, 27, 27, 57, 21, 63, 39]

cp's OEIS Frontend

A134661 Number of odd coefficients in (1 + x + x^3)^n.

Table of values

List of values

n	a(n)
0	1
1	3
2	3
3	7
4	3
5	9
6	7
7	13
8	3
9	9
10	9
11	19
12	7
13	21
14	13
15	27
16	3
17	9
18	9
19	21
20	9
21	27
22	19
23	35
24	7
25	21
26	21
27	41
28	13
29	39
30	27
31	55
32	3
33	9
34	9
35	21
36	9
37	27
38	21
39	39
40	9
41	27
42	27
43	55
44	19
45	57
46	35
47	73
48	7
49	21
50	21
51	49
52	21
53	63
54	41
55	75
56	13
57	39
58	39
59	79
60	27
61	81
62	55
63	109
64	3
65	9
66	9
67	21
68	9
69	27
70	21
71	39
72	9
73	27
74	27
75	57
76	21
77	63
78	39

n	a(n)
0	1
1	3
2	3
3	7
4	3
5	9
6	7
7	13
8	3
9	9
10	9
11	19
12	7
13	21
14	13
15	27
16	3
17	9
18	9
19	21
20	9
21	27
22	19
23	35
24	7
25	21
26	21
27	41
28	13
29	39
30	27
31	55
32	3
33	9
34	9
35	21
36	9
37	27
38	21
39	39
40	9
41	27
42	27
43	55
44	19
45	57
46	35
47	73
48	7
49	21
50	21
51	49
52	21
53	63
54	41
55	75
56	13
57	39
58	39
59	79
60	27
61	81
62	55
63	109
64	3
65	9
66	9
67	21
68	9
69	27
70	21
71	39
72	9
73	27
74	27
75	57
76	21
77	63
78	39

n	a(n)
0	1
1	3
2	3
3	7
4	3
5	9
6	7
7	13
8	3
9	9
10	9
11	19
12	7
13	21
14	13
15	27
16	3
17	9
18	9
19	21
20	9
21	27
22	19
23	35
24	7
25	21
26	21
27	41
28	13
29	39
30	27
31	55
32	3
33	9
34	9
35	21
36	9
37	27
38	21
39	39
40	9
41	27
42	27
43	55
44	19
45	57
46	35
47	73
48	7
49	21
50	21
51	49
52	21
53	63
54	41
55	75
56	13
57	39
58	39
59	79
60	27
61	81
62	55
63	109
64	3
65	9
66	9
67	21
68	9
69	27
70	21
71	39
72	9
73	27
74	27
75	57
76	21
77	63
78	39