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A009649 as a simple table

na(n)
00
11
2-1
31
4-12
535
6-195
71979
8-13552
9131333
10-1540845
1116920341
12-219934044
133138657015
14-46097651327
15745768998623
16-12886218266880
17233789283755465
18-4532667637516281
1992739558324236905
20-1991654643609977740

[0,1,-1,1,-12,35,-195,1979,-13552,131333,-1540845,
 16920341,-219934044,3138657015,-46097651327,
 745768998623,-12886218266880,233789283755465,
 -4532667637516281,92739558324236905,
 -1991654643609977740]