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A154342 as a simple table

na(n)
01
12
2-1
34
4-5
51
68
7-19
89
90
1016
11-65
1255
130
14-6
1532
16-211
17285
180
19-120
2030
2164
22-665
231351
240
25-1470
26810
27-90
28128
29-2059
306069
310
32-14280
3313020
34-3150
350

[1,2,-1,4,-5,1,8,-19,9,0,16,-65,55,0,-6,32,-211,
 285,0,-120,30,64,-665,1351,0,-1470,810,-90,128,
 -2059,6069,0,-14280,13020,-3150,0]