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A129794 as a simple table

na(n)
14
28
321
464
5204
6682
72340
88192
929127
10104857
11381300
121398101
135162220
1419173961
1571582788
16268435456
171010580540
183817748707
1914467258260
2054975581388
21209430786243
22799644820200
233059510616420
2411728124029610

[4,8,21,64,204,682,2340,8192,29127,104857,381300,
 1398101,5162220,19173961,71582788,268435456,
 1010580540,3817748707,14467258260,54975581388,
 209430786243,799644820200,3059510616420,
 11728124029610]