A125182 - cp's OEIS frontend

A125182 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that the set {p(i)-i, i=1,2,...,n} has exactly k elements (1<=k<=n).

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	1
8	4
9	12
10	7
11	1
12	4
13	38
14	54
15	23
16	1
17	8
18	77
19	248
20	303
21	83
22	1
23	6
24	160
25	824
26	2008
27	1636
28	405
29	1
30	11
31	285
32	2320
33	9449
34	15789
35	10352
36	2113
37	1
38	10
39	476
40	5564
41	37237
42	102726
43	133293
44	70916
45	12657
46	1
47	14
48	799
49	13172
50	122708
51	536900
52	1158368
53	1177168
54	537373
55	82297

[1, 1, 1, 1, 2, 3, 1, 4, 12, 7, 1, 4, 38, 54, 23, 1, 8, 77, 248, 303, 83, 1, 6, 160, 824, 2008, 1636, 405, 1, 11, 285, 2320, 9449, 15789, 10352, 2113, 1, 10, 476, 5564, 37237, 102726, 133293, 70916, 12657, 1, 14, 799, 13172, 122708, 536900, 1158368, 1177168, 537373, 82297]

cp's OEIS Frontend

A125182 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that the set {p(i)-i, i=1,2,...,n} has exactly k elements (1<=k<=n).

Table of values

List of values