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A307103 as a simple table

na(n)
00
11
2-2
312
4-96
5880
6-8720
790752
8-975936
910737152
10-120093056
111360051456
12-15556087296
13179424700416
14-2084953411584
1524393551634432
16-287204585508864
173400978267127808
18-40480500900446208
19484006813958356992
20-5810240353159839744
2170001749695581061120

[0,1,-2,12,-96,880,-8720,90752,-975936,10737152,
 -120093056,1360051456,-15556087296,179424700416,
 -2084953411584,24393551634432,-287204585508864,
 3400978267127808,-40480500900446208,
 484006813958356992,-5810240353159839744,
 70001749695581061120]