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A012002 as a simple table

na(n)
00
1-1
2-2
314
4568
52144
6-1061312
7-65851696
83745115008
91232648783744
1050799435228928
11-36670923310299136
12-8828746813705828352
13954888000296009790464
141122466427244127979911168

[0,-1,-2,14,568,2144,-1061312,-65851696,
 3745115008,1232648783744,50799435228928,
 -36670923310299136,-8828746813705828352,
 954888000296009790464,1122466427244127979911168]