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A009645 as a simple table

na(n)
00
10
22
3-6
430
5-180
61324
7-11424
8113376
9-1271232
1015889280
11-218989760
123298513600
13-53897151360
14949389619840
15-17931842342400
16361486218406400
17-7746121344512000
18175813073606092800
19-4213227577441536000

[0,0,2,-6,30,-180,1324,-11424,113376,-1271232,
 15889280,-218989760,3298513600,-53897151360,
 949389619840,-17931842342400,361486218406400,
 -7746121344512000,175813073606092800,
 -4213227577441536000]