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A137949 as a simple table

na(n)
10
20
3-1
4-2
50
62
70
818
90
10-4
11128
120
13-96
140
158
160
17-1875
180
19400
200
21-16
22-23328
230
2415552
250
26-1440
270
2832
290
30470596
310
32-96040
330
344704
350
36-64
378388608
380
39-5242880
400
41491520
420
43-14336
440
45128
460
47-215233605
480
4942515280
500
51-2204496
520
5341472
540
55-256
56-5000000000
570
583000000000
590
60-280000000

[0,0,-1,-2,0,2,0,18,0,-4,128,0,-96,0,8,0,-1875,0,
 400,0,-16,-23328,0,15552,0,-1440,0,32,0,470596,0,
 -96040,0,4704,0,-64,8388608,0,-5242880,0,491520,0,
 -14336,0,128,0,-215233605,0,42515280,0,-2204496,0,
 41472,0,-256,-5000000000,0,3000000000,0,
 -280000000]