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A016809 as a simple table

na(n)
00
1262144
2134217728
35159780352
468719476736
5512000000000
62641807540224
710578455953408
835184372088832
9101559956668416
10262144000000000
11618121839509504
121352605460594688
132779905883635712

[0,262144,134217728,5159780352,68719476736,
 512000000000,2641807540224,10578455953408,
 35184372088832,101559956668416,262144000000000,
 618121839509504,1352605460594688,2779905883635712]