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A191594 as a simple table

na(n)
01
11
22
33
4-48
5-1220
6-19440
7-69720
814407680
9953539776
1035565868800
11-210727440000
12-201519805132800
13-23287596250913280
14-1387143593335019520
1570361372381908608000
1636238719331572645888000
176110545675513945739673600
18457510061917491552313344000
19-86824257027562156263159398400
20-44392403385021894430349721600000

[1,1,2,3,-48,-1220,-19440,-69720,14407680,
 953539776,35565868800,-210727440000,
 -201519805132800,-23287596250913280,
 -1387143593335019520,70361372381908608000,
 36238719331572645888000,6110545675513945739673600,
 457510061917491552313344000,
 -86824257027562156263159398400,
 -44392403385021894430349721600000]