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A009323 as a simple table

na(n)
00
11
2-2
34
4-17
5113
6-829
76921
8-68018
9766909
10-9668901
11134950693
12-2070353196
1334628733267
14-626969184451
1512218295424331
16-255041910240464
175677409949583369
18-134260064803417113
193361378755164561417

[0,1,-2,4,-17,113,-829,6921,-68018,766909,
 -9668901,134950693,-2070353196,34628733267,
 -626969184451,12218295424331,-255041910240464,
 5677409949583369,-134260064803417113,
 3361378755164561417]