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A001487 as a simple table

na(n)
91
10-9
1136
12-84
13117
14-54
15-177
16540
17-837
18755
19-54
20-1197
212535
22-3204
232520
24-246
25-3150
266426
27-8106
287011
29-2844
30-3549
3110359
32-15120
3315804
34-11403
352574
368610
37-18972
3825425
39-25824
4018954
41-6165
42-10080
4325101
44-35262
4537799
46-31374
4717379
481929

[1,-9,36,-84,117,-54,-177,540,-837,755,-54,-1197,
 2535,-3204,2520,-246,-3150,6426,-8106,7011,-2844,
 -3549,10359,-15120,15804,-11403,2574,8610,-18972,
 25425,-25824,18954,-6165,-10080,25101,-35262,
 37799,-31374,17379,1929]