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A009646 as a simple table

na(n)
00
11
2-1
37
4-24
5175
6-1155
710477
8-100968
91147901
10-14251005
11197307251
12-2969362176
1348613104059
14-856679861583
1516197513235945
16-326703748009200
177005133086139705
18-159063002342367705
193813308579832354079

[0,1,-1,7,-24,175,-1155,10477,-100968,1147901,
 -14251005,197307251,-2969362176,48613104059,
 -856679861583,16197513235945,-326703748009200,
 7005133086139705,-159063002342367705,
 3813308579832354079]