A131084 - cp's OEIS frontend

A131084 A129686 * A007318. Riordan triangle (1+x, x/(1-x)).

n	a(n)
1	1
2	1
3	1
4	0
5	2
6	1
7	0
8	2
9	3
10	1
11	0
12	2
13	5
14	4
15	1
16	0
17	2
18	7
19	9
20	5
21	1
22	0
23	2
24	9
25	16
26	14
27	6
28	1
29	0
30	2
31	11
32	25
33	30
34	20
35	7
36	1
37	0
38	2
39	13
40	36
41	55
42	50
43	27
44	8
45	1
46	0
47	2
48	15
49	49
50	91
51	105
52	77
53	35
54	9
55	1

[1, 1, 1, 0, 2, 1, 0, 2, 3, 1, 0, 2, 5, 4, 1, 0, 2, 7, 9, 5, 1, 0, 2, 9, 16, 14, 6, 1, 0, 2, 11, 25, 30, 20, 7, 1, 0, 2, 13, 36, 55, 50, 27, 8, 1, 0, 2, 15, 49, 91, 105, 77, 35, 9, 1]

cp's OEIS Frontend

A131084 A129686 * A007318. Riordan triangle (1+x, x/(1-x)).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	0
5	2
6	1
7	0
8	2
9	3
10	1
11	0
12	2
13	5
14	4
15	1
16	0
17	2
18	7
19	9
20	5
21	1
22	0
23	2
24	9
25	16
26	14
27	6
28	1
29	0
30	2
31	11
32	25
33	30
34	20
35	7
36	1
37	0
38	2
39	13
40	36
41	55
42	50
43	27
44	8
45	1
46	0
47	2
48	15
49	49
50	91
51	105
52	77
53	35
54	9
55	1

n	a(n)
1	1
2	1
3	1
4	0
5	2
6	1
7	0
8	2
9	3
10	1
11	0
12	2
13	5
14	4
15	1
16	0
17	2
18	7
19	9
20	5
21	1
22	0
23	2
24	9
25	16
26	14
27	6
28	1
29	0
30	2
31	11
32	25
33	30
34	20
35	7
36	1
37	0
38	2
39	13
40	36
41	55
42	50
43	27
44	8
45	1
46	0
47	2
48	15
49	49
50	91
51	105
52	77
53	35
54	9
55	1

n	a(n)
1	1
2	1
3	1
4	0
5	2
6	1
7	0
8	2
9	3
10	1
11	0
12	2
13	5
14	4
15	1
16	0
17	2
18	7
19	9
20	5
21	1
22	0
23	2
24	9
25	16
26	14
27	6
28	1
29	0
30	2
31	11
32	25
33	30
34	20
35	7
36	1
37	0
38	2
39	13
40	36
41	55
42	50
43	27
44	8
45	1
46	0
47	2
48	15
49	49
50	91
51	105
52	77
53	35
54	9
55	1