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A009676 as a simple table

na(n)
00
11
2-1
35
4-24
5166
6-1350
713082
8-145376
91827376
10-25592400
11395118272
12-6664254432
13121895495632
14-2402856317680
1550776649007632
16-1144984530078720
1727440409496420096
18-696465326225541888

[0,1,-1,5,-24,166,-1350,13082,-145376,1827376,
 -25592400,395118272,-6664254432,121895495632,
 -2402856317680,50776649007632,-1144984530078720,
 27440409496420096,-696465326225541888]