A129776 - cp's OEIS frontend

A129776 Number of maximally-clustered hexagon-avoiding permutations in S_n; the maximally-clustered hexagon-avoiding permutations are those that avoid 3421, 4312, 4321, 46718235, 46781235, 56718234, 56781234.

n	a(n)
0	1
1	1
2	2
3	6
4	21
5	78
6	298
7	1157
8	4535
9	17872
10	70644
11	279704
12	1108462
13	4395045
14	17431206
15	69144643
16	274300461
17	1088215370
18	4317321235
19	17128527716
20	67956202025
21	269612504850
22	1069675361622
23	4243893926396
24	16837490364983
25	66802139457897
26	265035151393777

[1, 1, 2, 6, 21, 78, 298, 1157, 4535, 17872, 70644, 279704, 1108462, 4395045, 17431206, 69144643, 274300461, 1088215370, 4317321235, 17128527716, 67956202025, 269612504850, 1069675361622, 4243893926396, 16837490364983, 66802139457897, 265035151393777]

cp's OEIS Frontend

A129776 Number of maximally-clustered hexagon-avoiding permutations in S_n; the maximally-clustered hexagon-avoiding permutations are those that avoid 3421, 4312, 4321, 46718235, 46781235, 56718234, 56781234.

Table of values

List of values