A025128 - cp's OEIS frontend

A025128 a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = A014306.

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	2
7	2
8	2
9	3
10	2
11	3
12	4
13	4
14	4
15	5
16	5
17	6
18	7
19	7
20	6
21	7
22	8
23	8
24	8
25	9
26	9
27	10
28	11
29	11
30	11
31	12
32	12
33	13
34	13
35	13
36	13
37	15
38	15
39	15
40	15
41	16
42	16
43	18
44	17
45	18
46	18
47	19
48	19
49	20
50	20
51	21
52	21
53	23
54	22
55	23
56	22
57	23
58	24
59	24
60	24
61	25
62	25
63	26
64	27
65	27
66	27
67	28
68	29
69	29
70	29
71	30
72	30
73	31
74	32
75	32
76	32
77	33
78	33
79	34
80	34
81	35
82	35
83	36

[0, 0, 1, 0, 1, 2, 2, 2, 3, 2, 3, 4, 4, 4, 5, 5, 6, 7, 7, 6, 7, 8, 8, 8, 9, 9, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 15, 15, 15, 15, 16, 16, 18, 17, 18, 18, 19, 19, 20, 20, 21, 21, 23, 22, 23, 22, 23, 24, 24, 24, 25, 25, 26, 27, 27, 27, 28, 29, 29, 29, 30, 30, 31, 32, 32, 32, 33, 33, 34, 34, 35, 35, 36]

cp's OEIS Frontend

A025128 a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = A014306.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	2
7	2
8	2
9	3
10	2
11	3
12	4
13	4
14	4
15	5
16	5
17	6
18	7
19	7
20	6
21	7
22	8
23	8
24	8
25	9
26	9
27	10
28	11
29	11
30	11
31	12
32	12
33	13
34	13
35	13
36	13
37	15
38	15
39	15
40	15
41	16
42	16
43	18
44	17
45	18
46	18
47	19
48	19
49	20
50	20
51	21
52	21
53	23
54	22
55	23
56	22
57	23
58	24
59	24
60	24
61	25
62	25
63	26
64	27
65	27
66	27
67	28
68	29
69	29
70	29
71	30
72	30
73	31
74	32
75	32
76	32
77	33
78	33
79	34
80	34
81	35
82	35
83	36

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	2
7	2
8	2
9	3
10	2
11	3
12	4
13	4
14	4
15	5
16	5
17	6
18	7
19	7
20	6
21	7
22	8
23	8
24	8
25	9
26	9
27	10
28	11
29	11
30	11
31	12
32	12
33	13
34	13
35	13
36	13
37	15
38	15
39	15
40	15
41	16
42	16
43	18
44	17
45	18
46	18
47	19
48	19
49	20
50	20
51	21
52	21
53	23
54	22
55	23
56	22
57	23
58	24
59	24
60	24
61	25
62	25
63	26
64	27
65	27
66	27
67	28
68	29
69	29
70	29
71	30
72	30
73	31
74	32
75	32
76	32
77	33
78	33
79	34
80	34
81	35
82	35
83	36

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	2
7	2
8	2
9	3
10	2
11	3
12	4
13	4
14	4
15	5
16	5
17	6
18	7
19	7
20	6
21	7
22	8
23	8
24	8
25	9
26	9
27	10
28	11
29	11
30	11
31	12
32	12
33	13
34	13
35	13
36	13
37	15
38	15
39	15
40	15
41	16
42	16
43	18
44	17
45	18
46	18
47	19
48	19
49	20
50	20
51	21
52	21
53	23
54	22
55	23
56	22
57	23
58	24
59	24
60	24
61	25
62	25
63	26
64	27
65	27
66	27
67	28
68	29
69	29
70	29
71	30
72	30
73	31
74	32
75	32
76	32
77	33
78	33
79	34
80	34
81	35
82	35
83	36