A216368 - cp's OEIS frontend

A216368 Number T(n,k) of distinct values taken by k-th derivative of x^x^...^x (with n x's and parentheses inserted in all possible ways) at x=1; triangle T(n,k), n>=1, 1<=k<=n, read by rows.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	3
9	4
10	4
11	1
12	4
13	7
14	9
15	9
16	1
17	5
18	11
19	17
20	20
21	20
22	1
23	6
24	15
25	30
26	45
27	48
28	48
29	1
30	7
31	20
32	50
33	92
34	113
35	115
36	115
37	1
38	8
39	26
40	77
41	182
42	262
43	283
44	286
45	286
46	1
47	9
48	32
49	113
50	342
51	591
52	691
53	717
54	719
55	719
56	1
57	10
58	39
59	156
60	601
61	1263
62	1681
63	1815
64	1838
65	1842
66	1842

[1, 1, 1, 1, 2, 2, 1, 3, 4, 4, 1, 4, 7, 9, 9, 1, 5, 11, 17, 20, 20, 1, 6, 15, 30, 45, 48, 48, 1, 7, 20, 50, 92, 113, 115, 115, 1, 8, 26, 77, 182, 262, 283, 286, 286, 1, 9, 32, 113, 342, 591, 691, 717, 719, 719, 1, 10, 39, 156, 601, 1263, 1681, 1815, 1838, 1842, 1842]

cp's OEIS Frontend

A216368 Number T(n,k) of distinct values taken by k-th derivative of x^x^...^x (with n x's and parentheses inserted in all possible ways) at x=1; triangle T(n,k), n>=1, 1<=k<=n, read by rows.

Table of values

List of values