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A147178 as a simple table

na(n)
11
21
31
417
553
6329
73195
860697
91822001
1062512113
113196151109
12269695770307
1335398633644551

[1,1,1,17,53,329,3195,60697,1822001,62512113,
 3196151109,269695770307,35398633644551]