A095720 - cp's OEIS frontend

A095720 a(1)=1 and, for n>1, a(n)=a(n-1)+Floor(3n/4) if n is even, else a(n)=smallest positive integer which has not yet appeared in the sequence.

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	8
7	6
8	12
9	7
10	15
11	9
12	18
13	10
14	20
15	11
16	23
17	13
18	27
19	14
20	29
21	16
22	32
23	17
24	35
25	19
26	39
27	21
28	42
29	22
30	44
31	24
32	48
33	25
34	51
35	26
36	53
37	28
38	56
39	30
40	60
41	31
42	63
43	33
44	66
45	34
46	68
47	36
48	72
49	37
50	75
51	38
52	77
53	40
54	80
55	41
56	83
57	43
58	87
59	45
60	90
61	46
62	92
63	47
64	95
65	49
66	99
67	50
68	101
69	52
70	104
71	54

[1, 3, 2, 5, 4, 8, 6, 12, 7, 15, 9, 18, 10, 20, 11, 23, 13, 27, 14, 29, 16, 32, 17, 35, 19, 39, 21, 42, 22, 44, 24, 48, 25, 51, 26, 53, 28, 56, 30, 60, 31, 63, 33, 66, 34, 68, 36, 72, 37, 75, 38, 77, 40, 80, 41, 83, 43, 87, 45, 90, 46, 92, 47, 95, 49, 99, 50, 101, 52, 104, 54]

cp's OEIS Frontend

A095720 a(1)=1 and, for n>1, a(n)=a(n-1)+Floor(3n/4) if n is even, else a(n)=smallest positive integer which has not yet appeared in the sequence.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	8
7	6
8	12
9	7
10	15
11	9
12	18
13	10
14	20
15	11
16	23
17	13
18	27
19	14
20	29
21	16
22	32
23	17
24	35
25	19
26	39
27	21
28	42
29	22
30	44
31	24
32	48
33	25
34	51
35	26
36	53
37	28
38	56
39	30
40	60
41	31
42	63
43	33
44	66
45	34
46	68
47	36
48	72
49	37
50	75
51	38
52	77
53	40
54	80
55	41
56	83
57	43
58	87
59	45
60	90
61	46
62	92
63	47
64	95
65	49
66	99
67	50
68	101
69	52
70	104
71	54

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	8
7	6
8	12
9	7
10	15
11	9
12	18
13	10
14	20
15	11
16	23
17	13
18	27
19	14
20	29
21	16
22	32
23	17
24	35
25	19
26	39
27	21
28	42
29	22
30	44
31	24
32	48
33	25
34	51
35	26
36	53
37	28
38	56
39	30
40	60
41	31
42	63
43	33
44	66
45	34
46	68
47	36
48	72
49	37
50	75
51	38
52	77
53	40
54	80
55	41
56	83
57	43
58	87
59	45
60	90
61	46
62	92
63	47
64	95
65	49
66	99
67	50
68	101
69	52
70	104
71	54

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	8
7	6
8	12
9	7
10	15
11	9
12	18
13	10
14	20
15	11
16	23
17	13
18	27
19	14
20	29
21	16
22	32
23	17
24	35
25	19
26	39
27	21
28	42
29	22
30	44
31	24
32	48
33	25
34	51
35	26
36	53
37	28
38	56
39	30
40	60
41	31
42	63
43	33
44	66
45	34
46	68
47	36
48	72
49	37
50	75
51	38
52	77
53	40
54	80
55	41
56	83
57	43
58	87
59	45
60	90
61	46
62	92
63	47
64	95
65	49
66	99
67	50
68	101
69	52
70	104
71	54