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A167896 as a simple table

na(n)
01
15
220
380
4320
51280
65120
720480
881920
9327680
101310720
115242880
1220971520
1383886080
14335544320
151342177280
165368709110
1721474836400
1885899345450
19343597381200
201374389522400
215497558080000
2221990232281600
2387960928972800

[1,5,20,80,320,1280,5120,20480,81920,327680,
 1310720,5242880,20971520,83886080,335544320,
 1342177280,5368709110,21474836400,85899345450,
 343597381200,1374389522400,5497558080000,
 21990232281600,87960928972800]