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A165231 as a simple table

na(n)
01
18
2120
31856
428736
5444928
66888960
7106663936
81651511296
925570869248
10395921817600
116130182127616
1294915539501056
131469607174995968
1422754390483927040
15352313390342864896
165454979121614422016

[1,8,120,1856,28736,444928,6888960,106663936,
 1651511296,25570869248,395921817600,6130182127616,
 94915539501056,1469607174995968,22754390483927040,
 352313390342864896,5454979121614422016]