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A009643 as a simple table

na(n)
00
11
2-1
37
4-24
5155
6-1095
79497
8-94248
91059845
10-13281525
11183496091
12-2769635616
1345333709967
14-799674327179
1515121294153565
16-305107579902960
176542782753769737
18-148587216992008713
193562420906863755695

[0,1,-1,7,-24,155,-1095,9497,-94248,1059845,
 -13281525,183496091,-2769635616,45333709967,
 -799674327179,15121294153565,-305107579902960,
 6542782753769737,-148587216992008713,
 3562420906863755695]