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A147054 as a simple table

na(n)
11
21
31
41
51
67
721
847
9193
10927
116473
1256977
13532817
145726035
1580429995
161421425107
1732032166721
18887240799013
1928935423830217
201147385224061533
2156743981461830039

[1,1,1,1,1,7,21,47,193,927,6473,56977,532817,
 5726035,80429995,1421425107,32032166721,
 887240799013,28935423830217,1147385224061533,
 56743981461830039]