A215841 - cp's OEIS frontend

A215841 Second derivative of f_n at x=1, where f_n is the n-th of all functions that are representable as x^x^...^x with m>=1 x's and parentheses inserted in all possible ways.

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

[0, 2, 4, 2, 6, 4, 2, 2, 8, 6, 4, 4, 4, 2, 2, 2, 2, 10, 8, 6, 6, 6, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 12, 10, 8, 6, 8, 8, 6, 6, 4, 4, 4, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 14]

cp's OEIS Frontend

A215841 Second derivative of f_n at x=1, where f_n is the n-th of all functions that are representable as x^x^...^x with m>=1 x's and parentheses inserted in all possible ways.

Table of values

List of values

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

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

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