Problem

[Roberto Tauraso]

Here there are some matchings:
n=4:
8-1 7-2 6-3 5-4
n=7:
14-2 13-3 12-4  11-5 10-6 9-7
8-1
n=8:
16-9 15-10 14-11 13-12
8-1 7-2 6-3 5-4
n=9:
18-7 17-8 16-9
15-1 14-2 13-3 12-4 11-5 10-6
n=12:
24-1 23-2 22-3 21-4 20-5 19-6 18-7 17-8 16-9 15-10 14-11 13-12
n=13:
26-10 25-11 24-12 23-13
22-3 21-4 20-5 19-6 18-7 17-8 16-9
15-1 14-2
n=14:
28-21
27-9 26-10 25-11 24-12 22-14 20-16
23-2 19-6 18-7 17-8
15-1 13-3
5-4
n=15:
30-19 29-20 28-21 27-22 26-23
25-11
24-1 18-7 17-8 16-9 15-10 13-12
14-2
6-3 5-4
n=16:
32-17 31-18 30-19
29-7 28-8 27-9 26-10 25-24
22-14 20-16
23-2 21-4
15-1 13-12 11-5
6-3

Bye,
Roberto Tauraso