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A240320 as a simple table

na(n)
18
2444
335042
41352558
592600224
63462370700
7233738937688
88672268288766
9582902538705858
1021576256799357398
111448119540625358398
1253560507392284037968
133592992655465376146430
14132855464267785586209842

[8,444,35042,1352558,92600224,3462370700,
 233738937688,8672268288766,582902538705858,
 21576256799357398,1448119540625358398,
 53560507392284037968,3592992655465376146430,
 132855464267785586209842]