login

A263445 as a simple table

na(n)
01
11
2-1
34
4-36
5600
6-16584
7705600
8-43751232
93790108800
10-443539877760
1168218849036800
12-13478425925184000
133355402067989171200
14-1035218714714606822400
15390189256983139461120000
16-177430554756972746695065600
1796269372301568677170319360000

[1,1,-1,4,-36,600,-16584,705600,-43751232,
 3790108800,-443539877760,68218849036800,
 -13478425925184000,3355402067989171200,
 -1035218714714606822400,390189256983139461120000,
 -177430554756972746695065600,
 96269372301568677170319360000]