A025115 - cp's OEIS frontend

A025115 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

n	a(n)
1	0
2	0
3	1
4	3
5	5
6	0
7	0
8	0
9	1
10	3
11	5
12	7
13	9
14	11
15	13
16	15
17	17
18	0
19	1
20	3
21	5
22	7
23	9
24	11
25	13
26	15
27	17
28	19
29	21
30	23
31	25
32	27
33	29
34	32
35	36
36	40
37	44
38	9
39	11
40	13
41	15
42	17
43	19
44	21
45	23
46	25
47	27
48	29
49	31
50	33
51	35
52	37
53	39
54	41
55	44
56	48
57	52
58	56
59	60
60	64
61	68
62	72
63	76
64	80
65	84
66	88
67	92
68	27
69	29
70	31
71	33
72	35
73	37
74	39
75	41
76	43
77	45
78	47
79	49
80	51
81	53

[0, 0, 1, 3, 5, 0, 0, 0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 32, 36, 40, 44, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53]

cp's OEIS Frontend

A025115 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	3
5	5
6	0
7	0
8	0
9	1
10	3
11	5
12	7
13	9
14	11
15	13
16	15
17	17
18	0
19	1
20	3
21	5
22	7
23	9
24	11
25	13
26	15
27	17
28	19
29	21
30	23
31	25
32	27
33	29
34	32
35	36
36	40
37	44
38	9
39	11
40	13
41	15
42	17
43	19
44	21
45	23
46	25
47	27
48	29
49	31
50	33
51	35
52	37
53	39
54	41
55	44
56	48
57	52
58	56
59	60
60	64
61	68
62	72
63	76
64	80
65	84
66	88
67	92
68	27
69	29
70	31
71	33
72	35
73	37
74	39
75	41
76	43
77	45
78	47
79	49
80	51
81	53

n	a(n)
1	0
2	0
3	1
4	3
5	5
6	0
7	0
8	0
9	1
10	3
11	5
12	7
13	9
14	11
15	13
16	15
17	17
18	0
19	1
20	3
21	5
22	7
23	9
24	11
25	13
26	15
27	17
28	19
29	21
30	23
31	25
32	27
33	29
34	32
35	36
36	40
37	44
38	9
39	11
40	13
41	15
42	17
43	19
44	21
45	23
46	25
47	27
48	29
49	31
50	33
51	35
52	37
53	39
54	41
55	44
56	48
57	52
58	56
59	60
60	64
61	68
62	72
63	76
64	80
65	84
66	88
67	92
68	27
69	29
70	31
71	33
72	35
73	37
74	39
75	41
76	43
77	45
78	47
79	49
80	51
81	53

cp's OEIS Frontend

A025115 a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

Table of values

List of values

A025115 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

n	a(n)
1	0
2	0
3	1
4	3
5	5
6	0
7	0
8	0
9	1
10	3
11	5
12	7
13	9
14	11
15	13
16	15
17	17
18	0
19	1
20	3
21	5
22	7
23	9
24	11
25	13
26	15
27	17
28	19
29	21
30	23
31	25
32	27
33	29
34	32
35	36
36	40
37	44
38	9
39	11
40	13
41	15
42	17
43	19
44	21
45	23
46	25
47	27
48	29
49	31
50	33
51	35
52	37
53	39
54	41
55	44
56	48
57	52
58	56
59	60
60	64
61	68
62	72
63	76
64	80
65	84
66	88
67	92
68	27
69	29
70	31
71	33
72	35
73	37
74	39
75	41
76	43
77	45
78	47
79	49
80	51
81	53