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A357840 as a simple table

na(n)
16
29
320
440
565
668
796
8144
9192
10528
11576
121028
134097
1473728
1581920
16262148
17557056
186291456
199437184
2012582912
21201326592
22335544320
232415919104
241374389534720
2511258999068426240
2690071992547409920
27648518346341351424
2878398662313265594368
29116056878683004400771792896

[6,9,20,40,65,68,96,144,192,528,576,1028,4097,
 73728,81920,262148,557056,6291456,9437184,
 12582912,201326592,335544320,2415919104,
 1374389534720,11258999068426240,90071992547409920,
 648518346341351424,78398662313265594368,
 116056878683004400771792896]