A177250 - cp's OEIS frontend

A177250 Triangle read by rows: T(n,k) is the number of permutations of [n] having k adjacent 3-cycles (0 <= k <= floor(n/3)), i.e., having k cycles of the form (i, i+1, i+2).

n	a(n)
0	1
1	1
2	2
3	5
4	1
5	22
6	2
7	114
8	6
9	697
10	22
11	1
12	4923
13	114
14	3
15	39612
16	696
17	12
18	357899
19	4923
20	57
21	1
22	3588836
23	39612
24	348
25	4
26	39556420
27	357900
28	2460
29	20
30	475392841
31	3588836
32	19806
33	116
34	1
35	6187284605
36	39556420
37	178950
38	820
39	5
40	86701097310
41	475392840
42	1794420
43	6600
44	30

[1, 1, 2, 5, 1, 22, 2, 114, 6, 697, 22, 1, 4923, 114, 3, 39612, 696, 12, 357899, 4923, 57, 1, 3588836, 39612, 348, 4, 39556420, 357900, 2460, 20, 475392841, 3588836, 19806, 116, 1, 6187284605, 39556420, 178950, 820, 5, 86701097310, 475392840, 1794420, 6600, 30]

cp's OEIS Frontend

A177250 Triangle read by rows: T(n,k) is the number of permutations of [n] having k adjacent 3-cycles (0 <= k <= floor(n/3)), i.e., having k cycles of the form (i, i+1, i+2).

Table of values

List of values