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A004989 as a simple table

na(n)
01
1-6
2-9
3-36
4-189
5-1134
6-7371
7-50544
8-360126
9-2640924
10-19806930
11-151252920
12-1172210130
13-9197341020
14-72921775230
15-583374201840
16-4703454502335
17-38180983607190
18-311811366125385
19-2560135427134740
20-21121117273861605
21-175003543126281870
22-1455711290550435555

[1,-6,-9,-36,-189,-1134,-7371,-50544,-360126,
 -2640924,-19806930,-151252920,-1172210130,
 -9197341020,-72921775230,-583374201840,
 -4703454502335,-38180983607190,-311811366125385,
 -2560135427134740,-21121117273861605,
 -175003543126281870,-1455711290550435555]