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A115243 as a simple table

na(n)
00
12
212
350
4204
5818
63276
713106
852428
9209714
10838860
113355442
1213421772
1353687090
14214748364
15858993458
163435973836
1713743895346
1854975581388
19219902325554
20879609302220
213518437208882
2214073748835532
2356294995342130
24225179981368524
25900719925474098

[0,2,12,50,204,818,3276,13106,52428,209714,838860,
 3355442,13421772,53687090,214748364,858993458,
 3435973836,13743895346,54975581388,219902325554,
 879609302220,3518437208882,14073748835532,
 56294995342130,225179981368524,900719925474098]