A227542 - cp's OEIS frontend

A227542 a(n) is the number of all terms preceding a(n-1) that have the same even-odd parity as a(n-1).

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	3
6	1
7	2
8	4
9	5
10	3
11	4
12	6
13	7
14	5
15	6
16	8
17	9
18	7
19	8
20	10
21	11
22	9
23	10
24	12
25	13
26	11
27	12
28	14
29	15
30	13
31	14
32	16
33	17
34	15
35	16
36	18
37	19
38	17
39	18
40	20
41	21
42	19
43	20
44	22
45	23
46	21
47	22
48	24
49	25
50	23
51	24
52	26
53	27
54	25
55	26
56	28
57	29
58	27
59	28
60	30
61	31
62	29
63	30
64	32
65	33
66	31
67	32
68	34
69	35
70	33
71	34
72	36
73	37
74	35
75	36
76	38
77	39
78	37
79	38
80	40
81	41
82	39
83	40
84	42
85	43
86	41
87	42
88	44
89	45
90	43
91	44
92	46

[0, 0, 1, 0, 2, 3, 1, 2, 4, 5, 3, 4, 6, 7, 5, 6, 8, 9, 7, 8, 10, 11, 9, 10, 12, 13, 11, 12, 14, 15, 13, 14, 16, 17, 15, 16, 18, 19, 17, 18, 20, 21, 19, 20, 22, 23, 21, 22, 24, 25, 23, 24, 26, 27, 25, 26, 28, 29, 27, 28, 30, 31, 29, 30, 32, 33, 31, 32, 34, 35, 33, 34, 36, 37, 35, 36, 38, 39, 37, 38, 40, 41, 39, 40, 42, 43, 41, 42, 44, 45, 43, 44, 46]

cp's OEIS Frontend

A227542 a(n) is the number of all terms preceding a(n-1) that have the same even-odd parity as a(n-1).

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	3
6	1
7	2
8	4
9	5
10	3
11	4
12	6
13	7
14	5
15	6
16	8
17	9
18	7
19	8
20	10
21	11
22	9
23	10
24	12
25	13
26	11
27	12
28	14
29	15
30	13
31	14
32	16
33	17
34	15
35	16
36	18
37	19
38	17
39	18
40	20
41	21
42	19
43	20
44	22
45	23
46	21
47	22
48	24
49	25
50	23
51	24
52	26
53	27
54	25
55	26
56	28
57	29
58	27
59	28
60	30
61	31
62	29
63	30
64	32
65	33
66	31
67	32
68	34
69	35
70	33
71	34
72	36
73	37
74	35
75	36
76	38
77	39
78	37
79	38
80	40
81	41
82	39
83	40
84	42
85	43
86	41
87	42
88	44
89	45
90	43
91	44
92	46

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	3
6	1
7	2
8	4
9	5
10	3
11	4
12	6
13	7
14	5
15	6
16	8
17	9
18	7
19	8
20	10
21	11
22	9
23	10
24	12
25	13
26	11
27	12
28	14
29	15
30	13
31	14
32	16
33	17
34	15
35	16
36	18
37	19
38	17
39	18
40	20
41	21
42	19
43	20
44	22
45	23
46	21
47	22
48	24
49	25
50	23
51	24
52	26
53	27
54	25
55	26
56	28
57	29
58	27
59	28
60	30
61	31
62	29
63	30
64	32
65	33
66	31
67	32
68	34
69	35
70	33
71	34
72	36
73	37
74	35
75	36
76	38
77	39
78	37
79	38
80	40
81	41
82	39
83	40
84	42
85	43
86	41
87	42
88	44
89	45
90	43
91	44
92	46

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	3
6	1
7	2
8	4
9	5
10	3
11	4
12	6
13	7
14	5
15	6
16	8
17	9
18	7
19	8
20	10
21	11
22	9
23	10
24	12
25	13
26	11
27	12
28	14
29	15
30	13
31	14
32	16
33	17
34	15
35	16
36	18
37	19
38	17
39	18
40	20
41	21
42	19
43	20
44	22
45	23
46	21
47	22
48	24
49	25
50	23
51	24
52	26
53	27
54	25
55	26
56	28
57	29
58	27
59	28
60	30
61	31
62	29
63	30
64	32
65	33
66	31
67	32
68	34
69	35
70	33
71	34
72	36
73	37
74	35
75	36
76	38
77	39
78	37
79	38
80	40
81	41
82	39
83	40
84	42
85	43
86	41
87	42
88	44
89	45
90	43
91	44
92	46