A228860 - cp's OEIS frontend

A228860 Number of permutations i_1,...,i_n of 1,...,n with i_1 = 1 and i_n = n, and with the n adjacent sums i_1+i_2, i_2+i_3, ..., i_{n-1}+i_n, i_n+i_1 all coprime to n.

n	a(n)
1	1
2	1
3	0
4	1
5	2
6	1
7	40
8	36
9	144
10	78
11	126336
12	176
13	14035200
14	69480
15	779436
16	25401600
17	465334732800
18	1700352
19	127064889262080
20	1888106496
21	1479065243520
22	1774752094080
23	18353630943019008000
24	144127475712
25	116009818818379776000
26	30959322906758400
27	373881853408444416000

[1, 1, 0, 1, 2, 1, 40, 36, 144, 78, 126336, 176, 14035200, 69480, 779436, 25401600, 465334732800, 1700352, 127064889262080, 1888106496, 1479065243520, 1774752094080, 18353630943019008000, 144127475712, 116009818818379776000, 30959322906758400, 373881853408444416000]

cp's OEIS Frontend

A228860 Number of permutations i_1,...,i_n of 1,...,n with i_1 = 1 and i_n = n, and with the n adjacent sums i_1+i_2, i_2+i_3, ..., i_{n-1}+i_n, i_n+i_1 all coprime to n.

Table of values

List of values