A129775 - cp's OEIS frontend

A129775 Number of maximally clustered permutations in S_n; the maximally clustered permutations are those that avoid 3421, 4312 and 4321.

n	a(n)
0	1
1	1
2	2
3	6
4	21
5	78
6	298
7	1157
8	4539
9	17936
10	71251
11	284188
12	1137076
13	4561093
14	18333337
15	73816489
16	297635750
17	1201551286
18	4855672249
19	19640147061
20	79501958895
21	322037615290
22	1305256267511
23	5293166568270
24	21475362822956
25	87166344495561
26	353933533606927

[1, 1, 2, 6, 21, 78, 298, 1157, 4539, 17936, 71251, 284188, 1137076, 4561093, 18333337, 73816489, 297635750, 1201551286, 4855672249, 19640147061, 79501958895, 322037615290, 1305256267511, 5293166568270, 21475362822956, 87166344495561, 353933533606927]

cp's OEIS Frontend

A129775 Number of maximally clustered permutations in S_n; the maximally clustered permutations are those that avoid 3421, 4312 and 4321.

Table of values

List of values