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A240771 as a simple table

na(n)
12
228
3475
48319
5147231
62610234
746306024
8821735065
914584690111
10258881423308
114595421744553
1281575772171285
131448115454676354
1425706831513670064
15456347578032510469
168101099194201232529

[2,28,475,8319,147231,2610234,46306024,821735065,
 14584690111,258881423308,4595421744553,
 81575772171285,1448115454676354,25706831513670064,
 456347578032510469,8101099194201232529]