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A333956 as a simple table

na(n)
11
2-3
314
4-82
5546
6-3932
729816
8-234438
91893469
10-15612527
11130870098
12-1111844944
139552257052
14-82846987926
15724385135208
16-6378457007916
1756511184375548
18-503399149941744
194505973904735072
20-40508206566645846
21365585085331313000
22-3311041732282565260

[1,-3,14,-82,546,-3932,29816,-234438,1893469,
 -15612527,130870098,-1111844944,9552257052,
 -82846987926,724385135208,-6378457007916,
 56511184375548,-503399149941744,4505973904735072,
 -40508206566645846,365585085331313000,
 -3311041732282565260]