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A137375 as a simple table

na(n)
01
10
20
3-1
40
5-1
60
7-1
83
90
10-1
1110
120
13-1
1425
15-15
160
17-1
1856
19-105
200
21-1
22119
23-490
24105
250
26-1
27246
28-1918
291260
300
31-1
32501
33-6825
349450
35-945
360
37-1
381012
39-22935
4056980
41-17325
420
43-1
442035
45-74316
46302995
47-190575
4810395
490
50-1
514082
52-235092

[1,0,0,-1,0,-1,0,-1,3,0,-1,10,0,-1,25,-15,0,-1,56,
 -105,0,-1,119,-490,105,0,-1,246,-1918,1260,0,-1,
 501,-6825,9450,-945,0,-1,1012,-22935,56980,-17325,
 0,-1,2035,-74316,302995,-190575,10395,0,-1,4082,
 -235092]