A228886 - cp's OEIS frontend

A228886 Number of permutations i_0,i_1,...,i_n of 0,1,...,n with i_0 = 0 and i_n = n, and with i_0+i_1, i_1+i_2, ..., i_{n-1}+i_n, i_n+i_0 all coprime to both n-1 and n+1.

n	a(n)
1	1
2	0
3	1
4	0
5	1
6	8
7	3
8	24
9	78
10	1164
11	34
12	4021156
13	400
14	87180
15	2499480
16	7509358
17	1700352
18	39982182134232
19	1427688
20	212987263960
21	9533487948
22	36638961135462
23	29317847040
24	30258969747586970112
25	1655088666624

[1, 0, 1, 0, 1, 8, 3, 24, 78, 1164, 34, 4021156, 400, 87180, 2499480, 7509358, 1700352, 39982182134232, 1427688, 212987263960, 9533487948, 36638961135462, 29317847040, 30258969747586970112, 1655088666624]

cp's OEIS Frontend

A228886 Number of permutations i_0,i_1,...,i_n of 0,1,...,n with i_0 = 0 and i_n = n, and with i_0+i_1, i_1+i_2, ..., i_{n-1}+i_n, i_n+i_0 all coprime to both n-1 and n+1.

Table of values

List of values