A024855 - cp's OEIS frontend

A024855 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = A023531.

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

[1, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 5, 7, 9, 11, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 9, 11, 13, 15, 17, 19, 21, 23, 26, 29, 32, 35, 18, 20, 22, 24, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59, 62, 66, 70, 74, 78, 47, 50, 53, 56, 59, 62, 65, 68, 72, 76, 80]

cp's OEIS Frontend

A024855 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = A023531.

Table of values

List of values

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

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

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