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A147018 as a simple table

na(n)
11
21
31
41
55
69
721
835
9177
10589
114235
1215969
13164553
14879607
1512456629
1697189937
171947709409
1820669429409

[1,1,1,1,5,9,21,35,177,589,4235,15969,164553,
 879607,12456629,97189937,1947709409,20669429409]