A078628 - cp's OEIS frontend

A078628 Number of ways of arranging the numbers 1..n in a circle so that there is no consecutive triple i, i+1, i+2 or i, i-1, i-2 (mod n).

n	a(n)
1	1
2	1
3	0
4	4
5	12
6	76
7	494
8	3662
9	30574
10	284398
11	2918924
12	32791604
13	400400062
14	5281683678
15	74866857910
16	1135063409918
17	18330526475060
18	314169905117860
19	5695984717957246
20	108921059813769710
21	2190998123920252622
22	46250325111346491694

[1, 1, 0, 4, 12, 76, 494, 3662, 30574, 284398, 2918924, 32791604, 400400062, 5281683678, 74866857910, 1135063409918, 18330526475060, 314169905117860, 5695984717957246, 108921059813769710, 2190998123920252622, 46250325111346491694]

cp's OEIS Frontend

A078628 Number of ways of arranging the numbers 1..n in a circle so that there is no consecutive triple i, i+1, i+2 or i, i-1, i-2 (mod n).

Table of values

List of values