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A249875 as a simple table

na(n)
13
26
334
4136
5498
62082
78146
832946
9131058
10524232
112096928
128387712
1333550848
14134226562
15536859906
162147439624
178589943858
1834359775432
19137439101728
20549756406912
212199022661826
228796090647304
2335184374452498
24140737497809992
25562949943786834
262251799775147336

[3,6,34,136,498,2082,8146,32946,131058,524232,
 2096928,8387712,33550848,134226562,536859906,
 2147439624,8589943858,34359775432,137439101728,
 549756406912,2199022661826,8796090647304,
 35184374452498,140737497809992,562949943786834,
 2251799775147336]