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A051256 as a simple table

na(n)
01
13
27
333
4121
5843
65167
746233
8362881
93991683
1040279687
11522910113
126227383801
1393409304523
141313941673647
1522324392524313
16355687428096001
176758061133824003
18122000787836928007
192561305169719296033

[1,3,7,33,121,843,5167,46233,362881,3991683,
 40279687,522910113,6227383801,93409304523,
 1313941673647,22324392524313,355687428096001,
 6758061133824003,122000787836928007,
 2561305169719296033]