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A009452 as a simple table

na(n)
00
11
2-1
33
4-8
526
6-46
7-542
812272
9-196204
102970284
11-46125412
12747689152
13-12796612984
14231568711464
15-4435090726232
1689781803413632
17-1918433012222064
1843187041330469744
19-1022364892192828752

[0,1,-1,3,-8,26,-46,-542,12272,-196204,2970284,
 -46125412,747689152,-12796612984,231568711464,
 -4435090726232,89781803413632,-1918433012222064,
 43187041330469744,-1022364892192828752]