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A271017 as a simple table

na(n)
01
15
241
3185
4761
53065
612281
749145
8196601
9786425
103145721
1112582905
1250331641
13201326585
14805306361
153221225465

[1,5,41,185,761,3065,12281,49145,196601,786425,
 3145721,12582905,50331641,201326585,805306361,
 3221225465]