A109857 - cp's OEIS frontend

A109857 Next 2n - 1 odd numbers in decreasing order followed by next 2n even numbers in decreasing order.

n	a(n)
1	1
2	4
3	2
4	7
5	5
6	3
7	12
8	10
9	8
10	6
11	17
12	15
13	13
14	11
15	9
16	24
17	22
18	20
19	18
20	16
21	14
22	31
23	29
24	27
25	25
26	23
27	21
28	19
29	40
30	38
31	36
32	34
33	32
34	30
35	28
36	26
37	49
38	47
39	45
40	43
41	41
42	39
43	37
44	35
45	33
46	60
47	58
48	56
49	54
50	52
51	50
52	48
53	46
54	44
55	42
56	71
57	69
58	67
59	65
60	63
61	61
62	59
63	57
64	55
65	53
66	51
67	84
68	82
69	80
70	78
71	76
72	74

[1, 4, 2, 7, 5, 3, 12, 10, 8, 6, 17, 15, 13, 11, 9, 24, 22, 20, 18, 16, 14, 31, 29, 27, 25, 23, 21, 19, 40, 38, 36, 34, 32, 30, 28, 26, 49, 47, 45, 43, 41, 39, 37, 35, 33, 60, 58, 56, 54, 52, 50, 48, 46, 44, 42, 71, 69, 67, 65, 63, 61, 59, 57, 55, 53, 51, 84, 82, 80, 78, 76, 74]

cp's OEIS Frontend

A109857 Next 2n - 1 odd numbers in decreasing order followed by next 2n even numbers in decreasing order.

Table of values

List of values

n	a(n)
1	1
2	4
3	2
4	7
5	5
6	3
7	12
8	10
9	8
10	6
11	17
12	15
13	13
14	11
15	9
16	24
17	22
18	20
19	18
20	16
21	14
22	31
23	29
24	27
25	25
26	23
27	21
28	19
29	40
30	38
31	36
32	34
33	32
34	30
35	28
36	26
37	49
38	47
39	45
40	43
41	41
42	39
43	37
44	35
45	33
46	60
47	58
48	56
49	54
50	52
51	50
52	48
53	46
54	44
55	42
56	71
57	69
58	67
59	65
60	63
61	61
62	59
63	57
64	55
65	53
66	51
67	84
68	82
69	80
70	78
71	76
72	74

n	a(n)
1	1
2	4
3	2
4	7
5	5
6	3
7	12
8	10
9	8
10	6
11	17
12	15
13	13
14	11
15	9
16	24
17	22
18	20
19	18
20	16
21	14
22	31
23	29
24	27
25	25
26	23
27	21
28	19
29	40
30	38
31	36
32	34
33	32
34	30
35	28
36	26
37	49
38	47
39	45
40	43
41	41
42	39
43	37
44	35
45	33
46	60
47	58
48	56
49	54
50	52
51	50
52	48
53	46
54	44
55	42
56	71
57	69
58	67
59	65
60	63
61	61
62	59
63	57
64	55
65	53
66	51
67	84
68	82
69	80
70	78
71	76
72	74

cp's OEIS Frontend

A109857 Next 2*n - 1 odd numbers in decreasing order followed by next 2*n even numbers in decreasing order.

Table of values

List of values

A109857 Next 2n - 1 odd numbers in decreasing order followed by next 2n even numbers in decreasing order.

n	a(n)
1	1
2	4
3	2
4	7
5	5
6	3
7	12
8	10
9	8
10	6
11	17
12	15
13	13
14	11
15	9
16	24
17	22
18	20
19	18
20	16
21	14
22	31
23	29
24	27
25	25
26	23
27	21
28	19
29	40
30	38
31	36
32	34
33	32
34	30
35	28
36	26
37	49
38	47
39	45
40	43
41	41
42	39
43	37
44	35
45	33
46	60
47	58
48	56
49	54
50	52
51	50
52	48
53	46
54	44
55	42
56	71
57	69
58	67
59	65
60	63
61	61
62	59
63	57
64	55
65	53
66	51
67	84
68	82
69	80
70	78
71	76
72	74