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A178808 as a simple table

na(n)
11
27
397
41791
538241
6892039
722092673
8571387903
915271248769
10418796912007
1111725812711009
12333962374092543
139648543623050593
14282164539499639559
158338391167566634497
16248661515283002490879
177474768663941435203073

[1,7,97,1791,38241,892039,22092673,571387903,
 15271248769,418796912007,11725812711009,
 333962374092543,9648543623050593,
 282164539499639559,8338391167566634497,
 248661515283002490879,7474768663941435203073]