A180190 - cp's OEIS frontend

A180190 Triangle read by rows: T(n,k) is the number of permutations p of [n] for which k is the smallest among the positive differences p(i+1) - p(i); k=0 for the reversal of the identity permutation (0<=k<=n-1).

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	2
7	1
8	13
9	6
10	4
11	1
12	67
13	30
14	14
15	8
16	1
17	411
18	178
19	80
20	34
21	16
22	1
23	2921
24	1236
25	530
26	234
27	86
28	32
29	1
30	23633
31	9828
32	4122
33	1744
34	702
35	226
36	64
37	1
38	214551
39	88028
40	36320
41	14990
42	6094
43	2154
44	614
45	128
46	1
47	2160343
48	876852
49	357332
50	145242
51	58468
52	21842
53	6750
54	1714
55	256

[1, 1, 1, 1, 3, 2, 1, 13, 6, 4, 1, 67, 30, 14, 8, 1, 411, 178, 80, 34, 16, 1, 2921, 1236, 530, 234, 86, 32, 1, 23633, 9828, 4122, 1744, 702, 226, 64, 1, 214551, 88028, 36320, 14990, 6094, 2154, 614, 128, 1, 2160343, 876852, 357332, 145242, 58468, 21842, 6750, 1714, 256]

cp's OEIS Frontend

A180190 Triangle read by rows: T(n,k) is the number of permutations p of [n] for which k is the smallest among the positive differences p(i+1) - p(i); k=0 for the reversal of the identity permutation (0<=k<=n-1).

Table of values

List of values