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A012703 as a simple table

na(n)
00
10
22
3-3
416
5-50
6488
7-3024
835376
9-313704
104119552
11-46248840
12682997280
13-9209575440
14152505104880
15-2394128401560
1644145984906240
17-789552273397440
1816082343831221760
19-322420285049880960

[0,0,2,-3,16,-50,488,-3024,35376,-313704,4119552,
 -46248840,682997280,-9209575440,152505104880,
 -2394128401560,44145984906240,-789552273397440,
 16082343831221760,-322420285049880960]