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A081093 as a simple table

na(n)
13
27
331
4127
53583
68191
7131071
8524287
914680063
101073479679
112147483647
12266287972351
134260607557631
1417591112302591
15246290604621823
1617996806323437567
171152917106560335871
182305843009213693951

[3,7,31,127,3583,8191,131071,524287,14680063,
 1073479679,2147483647,266287972351,4260607557631,
 17591112302591,246290604621823,17996806323437567,
 1152917106560335871,2305843009213693951]