A228109 - cp's OEIS frontend

A228109 Height after n-th step of an infinite staircase which is the lower part of a structure whose upper part is the infinite Dyck path of A228110.

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

[0, -1, 0, -1, 0, -1, 0, -1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 2, 1, 2, 1, 0, -1, 0, -1, 0, 1, 2, 1, 2, 3, 4, 3, 4, 3, 2, 1, 0, -1, 0, -1, 0, 1, 0, 1, 2, 1, 2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 6, 5, 6, 5, 4, 5, 4, 3, 2, 1, 0, -1]

cp's OEIS Frontend

A228109 Height after n-th step of an infinite staircase which is the lower part of a structure whose upper part is the infinite Dyck path of A228110.

Table of values

List of values

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

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

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