A215842 - cp's OEIS frontend

A215842 Third 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	3
3	12
4	9
5	27
6	18
7	15
8	9
9	48
10	33
11	24
12	24
13	18
14	21
15	15
16	9
17	9
18	75
19	54
20	39
21	39
22	33
23	30
24	24
25	30
26	24
27	18
28	18
29	27
30	21
31	15
32	15
33	15
34	9
35	9
36	9
37	9
38	108
39	81
40	60
41	45
42	60
43	54
44	45
45	39
46	36
47	30
48	24
49	45
50	39
51	33
52	33
53	36
54	30
55	24
56	24
57	36
58	30
59	24
60	24
61	24
62	18
63	18
64	18
65	18
66	33
67	27

[0, 3, 12, 9, 27, 18, 15, 9, 48, 33, 24, 24, 18, 21, 15, 9, 9, 75, 54, 39, 39, 33, 30, 24, 30, 24, 18, 18, 27, 21, 15, 15, 15, 9, 9, 9, 9, 108, 81, 60, 45, 60, 54, 45, 39, 36, 30, 24, 45, 39, 33, 33, 36, 30, 24, 24, 36, 30, 24, 24, 24, 18, 18, 18, 18, 33, 27]

cp's OEIS Frontend

A215842 Third 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	3
3	12
4	9
5	27
6	18
7	15
8	9
9	48
10	33
11	24
12	24
13	18
14	21
15	15
16	9
17	9
18	75
19	54
20	39
21	39
22	33
23	30
24	24
25	30
26	24
27	18
28	18
29	27
30	21
31	15
32	15
33	15
34	9
35	9
36	9
37	9
38	108
39	81
40	60
41	45
42	60
43	54
44	45
45	39
46	36
47	30
48	24
49	45
50	39
51	33
52	33
53	36
54	30
55	24
56	24
57	36
58	30
59	24
60	24
61	24
62	18
63	18
64	18
65	18
66	33
67	27

n	a(n)
1	0
2	3
3	12
4	9
5	27
6	18
7	15
8	9
9	48
10	33
11	24
12	24
13	18
14	21
15	15
16	9
17	9
18	75
19	54
20	39
21	39
22	33
23	30
24	24
25	30
26	24
27	18
28	18
29	27
30	21
31	15
32	15
33	15
34	9
35	9
36	9
37	9
38	108
39	81
40	60
41	45
42	60
43	54
44	45
45	39
46	36
47	30
48	24
49	45
50	39
51	33
52	33
53	36
54	30
55	24
56	24
57	36
58	30
59	24
60	24
61	24
62	18
63	18
64	18
65	18
66	33
67	27

n	a(n)
1	0
2	3
3	12
4	9
5	27
6	18
7	15
8	9
9	48
10	33
11	24
12	24
13	18
14	21
15	15
16	9
17	9
18	75
19	54
20	39
21	39
22	33
23	30
24	24
25	30
26	24
27	18
28	18
29	27
30	21
31	15
32	15
33	15
34	9
35	9
36	9
37	9
38	108
39	81
40	60
41	45
42	60
43	54
44	45
45	39
46	36
47	30
48	24
49	45
50	39
51	33
52	33
53	36
54	30
55	24
56	24
57	36
58	30
59	24
60	24
61	24
62	18
63	18
64	18
65	18
66	33
67	27