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A009453 as a simple table

na(n)
00
11
2-1
3-1
48
5-14
6-46
7314
848
9-7244
1013484
11233804
12-1002112
13-10692824
1479853864
15661278344
16-7758425472
17-52788251504
18928828095344
195226295555184
20-135732896444032
21-617858881186784
2223892314499643424
2383518025870961824

[0,1,-1,-1,8,-14,-46,314,48,-7244,13484,233804,
 -1002112,-10692824,79853864,661278344,-7758425472,
 -52788251504,928828095344,5226295555184,
 -135732896444032,-617858881186784,
 23892314499643424,83518025870961824]