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A129683 as a simple table

na(n)
01
14
228
3272
43344
549472
6852928
716758016
8369082624
98996922368
10240294124544
116974172532736
12218457925292032
137342688736329728
14263513011737051136
1510054112734940561408
16406301504472849907712
1717333090863574658842624
18778298003006760943353856

[1,4,28,272,3344,49472,852928,16758016,369082624,
 8996922368,240294124544,6974172532736,
 218457925292032,7342688736329728,
 263513011737051136,10054112734940561408,
 406301504472849907712,17333090863574658842624,
 778298003006760943353856]