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A238947 as a simple table

na(n)
18
2100
33524
45084
536680
677980
721474824
8134201344
9148647496
10300741464
1173851531256
12153122539756
13778318386944
146669171349484
1516526971109344
16596403262068016
179376599920124524
1826698166963373164
19140144514160214876
201613032378604451500

[8,100,3524,5084,36680,77980,21474824,134201344,
 148647496,300741464,73851531256,153122539756,
 778318386944,6669171349484,16526971109344,
 596403262068016,9376599920124524,
 26698166963373164,140144514160214876,
 1613032378604451500]