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A115599 as a simple table

na(n)
12
29
350
4289
51682
69801
757122
8332929
91940450
1011309769
1165918162
12384199201
132239277042
1413051463049
1576069501250
16443365544449
172584123765442
1815061377048201
1987784138523762
20511643454094369
212982076586042450
2217380816062160329
23101302819786919522

[2,9,50,289,1682,9801,57122,332929,1940450,
 11309769,65918162,384199201,2239277042,
 13051463049,76069501250,443365544449,
 2584123765442,15061377048201,87784138523762,
 511643454094369,2982076586042450,
 17380816062160329,101302819786919522]