A030340 - cp's OEIS frontend

A030340 a(n)=(# 1's)-(# 2's) in first n terms of A003137.

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

[1, 0, 1, 1, 2, 3, 4, 3, 2, 2, 1, 2, 1, 0, 1, 1, 1, 2, 2, 3, 4, 4, 3, 4, 5, 5, 6, 7, 8, 9, 10, 9, 10, 9, 9, 10, 9, 10, 11, 10, 9, 8, 8, 8, 7, 7, 8, 7, 7, 6, 5, 6, 6, 5, 6, 7, 6, 7, 6, 5, 4, 4, 3, 2, 3, 2, 1, 0, 1, 1, 1, 1, 2, 2, 2, 3, 4, 4, 4, 3, 4, 4, 5, 5]

cp's OEIS Frontend

A030340 a(n)=(# 1's)-(# 2's) in first n terms of A003137.

Table of values

List of values

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

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

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