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A166677 as a simple table

na(n)
01
15
218
366
4280
51420
68544
759836
8478720
94308516
1043085200
11473937244
125687246976
1373934210740
141035078950416
1515526184256300
16248418948100864
174223122117714756
1876016198118865680
191444307764258447996

[1,5,18,66,280,1420,8544,59836,478720,4308516,
 43085200,473937244,5687246976,73934210740,
 1035078950416,15526184256300,248418948100864,
 4223122117714756,76016198118865680,
 1444307764258447996]