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A157303 as a simple table

na(n)
01
11
21
3-4
4-19
5134
61074
7-10158
8-110067
91302086
1017451662
11-248857456
12-3948994550
1366104803660
141210719480268
15-23304935437410
16-484165206834051
1710541640152174406
18245149591293286518
19-5958110923842801192

[1,1,1,-4,-19,134,1074,-10158,-110067,1302086,
 17451662,-248857456,-3948994550,66104803660,
 1210719480268,-23304935437410,-484165206834051,
 10541640152174406,245149591293286518,
 -5958110923842801192]