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A009597 as a simple table

na(n)
00
11
2-1
34
4-18
5106
6-750
76196
8-58408
9617716
10-7234020
1192842696
12-1294948776
1319493497024
14-314874396928
155430592728016
16-99578626460160
171934092698170896
18-39660351268817808
19856128235903319296

[0,1,-1,4,-18,106,-750,6196,-58408,617716,
 -7234020,92842696,-1294948776,19493497024,
 -314874396928,5430592728016,-99578626460160,
 1934092698170896,-39660351268817808,
 856128235903319296]