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A002609 as a simple table

na(n)
11
2-20
3-80
4144
5610
6-448
7-1120
82240
9-3423
10-12200
1114800
1229440
13-5470
14-6272
15-48800
16-81664
1773090
1868460
1915600
2087840
21-139776
2282880
23189920
24-474112
25-18525
26109400
27-251040
28412160
29-128222
30-273280
3154400
321059840
331847040

[1,-20,-80,144,610,-448,-1120,2240,-3423,-12200,
 14800,29440,-5470,-6272,-48800,-81664,73090,68460,
 15600,87840,-139776,82880,189920,-474112,-18525,
 109400,-251040,412160,-128222,-273280,54400,
 1059840,1847040]