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A012609 as a simple table

na(n)
01
1-12
23472
3-20044992
4-47937777408
5-20305698249280512
6-2854719816291959009280
7-1250271985277826533770444800
8-852308886538376231161133484933120
9-1020041468410487908146642041792342261760
10-1902990477565541776130152995745141108333608960

[1,-12,3472,-20044992,-47937777408,
 -20305698249280512,-2854719816291959009280,
 -1250271985277826533770444800,
 -852308886538376231161133484933120,
 -1020041468410487908146642041792342261760,
 -1902990477565541776130152995745141108333608960]