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A156647 as a simple table

na(n)
01
11
21
31
4-3
52
61
7-8
8144
96
101
11-15
122304
13-97200
1424
151
16-24
1714400
18-22579200
19914457600
20120
211
22-35
2357600
24-857304000
257517247897600
26-119833267276800
27720
281
29-48
30176400
31-13548902400
323163657512960000
33-85018329720343756800
34218719679433615360000
355040

[1,1,1,1,-3,2,1,-8,144,6,1,-15,2304,-97200,24,1,
 -24,14400,-22579200,914457600,120,1,-35,57600,
 -857304000,7517247897600,-119833267276800,720,1,
 -48,176400,-13548902400,3163657512960000,
 -85018329720343756800,218719679433615360000,5040]