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A173393 as a simple table

na(n)
122
2164
31758
420776
5248882
62986044
735831878
8429981776
95159780442
1061917364324
11743008370798
128916100448376
13106993205379202
141283918464549004
1515407021574586518
16184884258895036576

[22,164,1758,20776,248882,2986044,35831878,
 429981776,5159780442,61917364324,743008370798,
 8916100448376,106993205379202,1283918464549004,
 15407021574586518,184884258895036576]