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A256003 as a simple table

na(n)
00
12
20
31
40
5-1
60
71
80
9-1
100
115
120
13-691
140
157
160
17-3617
180
1943867
200
21-174611
220
23854513
240
25-236364091
260
278553103
280
29-23749461029
300
318615841276005
320
33-7709321041217
340
352577687858367
360
37-26315271553053477373
380

[0,2,0,1,0,-1,0,1,0,-1,0,5,0,-691,0,7,0,-3617,0,
 43867,0,-174611,0,854513,0,-236364091,0,8553103,0,
 -23749461029,0,8615841276005,0,-7709321041217,0,
 2577687858367,0,-26315271553053477373,0]