A047921 - cp's OEIS frontend

A047921 Triangle of numbers a(n,k) = number of permutations on n letters containing k 3-sequences (n >= 0, 0<=k<=max(0,n-2)).

n	a(n)
0	1
1	1
2	2
3	5
4	1
5	21
6	2
7	1
8	106
9	11
10	2
11	1
12	643
13	62
14	12
15	2
16	1
17	4547
18	406
19	71
20	13
21	2
22	1
23	36696
24	3046
25	481
26	80
27	14
28	2
29	1
30	332769
31	25737
32	3708
33	559
34	89
35	15
36	2
37	1
38	3349507
39	242094
40	32028
41	4414
42	640
43	98
44	16
45	2
46	1
47	37054436
48	2510733
49	306723
50	38893
51	5164
52	724
53	107
54	17
55	2
56	1

[1, 1, 2, 5, 1, 21, 2, 1, 106, 11, 2, 1, 643, 62, 12, 2, 1, 4547, 406, 71, 13, 2, 1, 36696, 3046, 481, 80, 14, 2, 1, 332769, 25737, 3708, 559, 89, 15, 2, 1, 3349507, 242094, 32028, 4414, 640, 98, 16, 2, 1, 37054436, 2510733, 306723, 38893, 5164, 724, 107, 17, 2, 1]

cp's OEIS Frontend

A047921 Triangle of numbers a(n,k) = number of permutations on n letters containing k 3-sequences (n >= 0, 0<=k<=max(0,n-2)).

Table of values

List of values