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A195908 as a simple table

na(n)
11
27
349
4343
5117649
6823543
7282475249
81977326743
911398895185373143
10378818692265664781682717625943

[1,7,49,343,117649,823543,282475249,1977326743,
 11398895185373143,378818692265664781682717625943]