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A115149 as a simple table

na(n)
01
1-10
235
3-50
425
5-2
60
70
80
90
10-1
11-10
12-65
13-350
14-1700
15-7752
16-33915
17-144210
18-600875
19-2466750
20-10015005
21-40320150
22-161280600
23-641886000
24-2544619500
25-10056336264
26-39645171810
27-155989499540
28-612815891050
29-2404551645100
30-9425842448792

[1,-10,35,-50,25,-2,0,0,0,0,-1,-10,-65,-350,-1700,
 -7752,-33915,-144210,-600875,-2466750,-10015005,
 -40320150,-161280600,-641886000,-2544619500,
 -10056336264,-39645171810,-155989499540,
 -612815891050,-2404551645100,-9425842448792]