login

A081049 as a simple table

na(n)
01
10
25
3-5
474
5-154
62484
7-8028
8149904
9-663696
1014257440
11-80627040
121965444480
13-13575738240
14370643938560
15-3031488633600
1691657072281600
17-867718162483200
1828779361764249600
19-309920046408806400
2011185850044938240000
21-135153868608460800000

[1,0,5,-5,74,-154,2484,-8028,149904,-663696,
 14257440,-80627040,1965444480,-13575738240,
 370643938560,-3031488633600,91657072281600,
 -867718162483200,28779361764249600,
 -309920046408806400,11185850044938240000,
 -135153868608460800000]