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A166859 as a simple table

na(n)
01
15
220
380
4320
51280
65120
720480
881920
9327680
101310720
115242880
1220971520
1383886070
14335544240
151342176810
165368706640
1721474824160
1885899287040
19343597109760
201374388285440
215497552527360
2221990207651840
2387960820776960

[1,5,20,80,320,1280,5120,20480,81920,327680,
 1310720,5242880,20971520,83886070,335544240,
 1342176810,5368706640,21474824160,85899287040,
 343597109760,1374388285440,5497552527360,
 21990207651840,87960820776960]