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A281770 as a simple table

na(n)
10
268
3374
45948
549986
6502276
74845178
843943360
9414035752
103763905492
1134161108524
12309491219676
132770210355448
1424781891977992
15220487430433918
161953506661837984
1717268182347051482
18152093095781502104

[0,68,374,5948,49986,502276,4845178,43943360,
 414035752,3763905492,34161108524,309491219676,
 2770210355448,24781891977992,220487430433918,
 1953506661837984,17268182347051482,
 152093095781502104]