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A296742 as a simple table

na(n)
01
12
24
3-8
42448
5130976
6-2342848
7-239130240
899052990720
98918588764672
10-2795242017684480
11-92786315822417920
12279479081010906828800
13-57316070780459900928
14-39411396653183724314673152
155932051008707372732672475136
1610689040617354387626585873252352

[1,2,4,-8,2448,130976,-2342848,-239130240,
 99052990720,8918588764672,-2795242017684480,
 -92786315822417920,279479081010906828800,
 -57316070780459900928,-39411396653183724314673152,
 5932051008707372732672475136,
 10689040617354387626585873252352]