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A129378 as a simple table

na(n)
01
11
24
320
4116
5744
65160
739360
8350784
93749760
1042940800
11442713600
124650877440
13109244298240
142833294464000
15-3487131648000
16-2166903606067200
1751809012320665600
186808619561103360000
19-131306587205713920000
20-26982365129174827008000
21595860034297401409536000

[1,1,4,20,116,744,5160,39360,350784,3749760,
 42940800,442713600,4650877440,109244298240,
 2833294464000,-3487131648000,-2166903606067200,
 51809012320665600,6808619561103360000,
 -131306587205713920000,-26982365129174827008000,
 595860034297401409536000]