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A319891 as a simple table

na(n)
18
256
3336
41680
56720
620160
740320
840320
940304
1040080
1136960
12-3360
13-483840
14-5725440
15-57617280
16-518878080
17-518878056
18-518877528
19-518865936
20-518623056
21-513777600
22-421968960
231225486080
2429135312640
2529135312608
2629135311648
2729135282880

[8,56,336,1680,6720,20160,40320,40320,40304,40080,
 36960,-3360,-483840,-5725440,-57617280,-518878080,
 -518878056,-518877528,-518865936,-518623056,
 -513777600,-421968960,1225486080,29135312640,
 29135312608,29135311648,29135282880]