login

A045406 as a simple table

na(n)
21
33
4-1
50
64
7-28
8188
9-1368
1011016
11-98208
12964512
13-10370880
14121337280
15-1535880960
1620924455680
17-305396421120
184755302899200
19-78700195123200
201379748896870400
21-25546854999859200
22498194992408780800
23-10207190048993280000
24219216795045212160000

[1,3,-1,0,4,-28,188,-1368,11016,-98208,964512,
 -10370880,121337280,-1535880960,20924455680,
 -305396421120,4755302899200,-78700195123200,
 1379748896870400,-25546854999859200,
 498194992408780800,-10207190048993280000,
 219216795045212160000]