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A133480 as a simple table

na(n)
01
1-2
210
3-80
4880
5-12320
6209440
7-4188800
896342400
9-2504902400
1072642169600
11-2324549427200
1281359229952000
13-3091650738176000
14126757680265216000
15-5577337931669504000
16262134882788466688000
17-13106744139423334400000
18694657439389436723200000
19-38900816605808456499200000

[1,-2,10,-80,880,-12320,209440,-4188800,96342400,
 -2504902400,72642169600,-2324549427200,
 81359229952000,-3091650738176000,
 126757680265216000,-5577337931669504000,
 262134882788466688000,-13106744139423334400000,
 694657439389436723200000,
 -38900816605808456499200000]