A257808 - cp's OEIS frontend

A257808 a(n) = number of nonzero even numbers in range 0 .. n of A233271, the infinite trunk of inverted binary beanstalk.

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

[0, 0, 1, 2, 2, 3, 4, 4, 5, 5, 6, 7, 7, 8, 9, 10, 11, 11, 11, 12, 13, 13, 14, 14, 14, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 20, 21, 22, 22, 23, 24, 24, 24, 25, 26, 27, 28, 29, 30, 30, 31, 32, 32, 32, 32, 32, 33, 33, 34, 35, 35, 36, 37, 38, 38, 38, 39, 40, 40, 41, 41, 42, 43, 43, 43, 43, 43, 43, 44, 45, 46, 46, 46, 46, 47, 48, 49, 50, 51]

cp's OEIS Frontend

A257808 a(n) = number of nonzero even numbers in range 0 .. n of A233271, the infinite trunk of inverted binary beanstalk.

Table of values

List of values

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

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

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