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A047970 as a simple table

na(n)
01
12
25
314
443
5144
6523
72048
88597
938486
10182905
11919146
124866871
1327068420
14157693007
15959873708
166091057009
1740213034874
18275699950381
191959625294310
2014418124498211
21109655727901592
22860946822538675
236969830450679864
2458114638923638573

[1,2,5,14,43,144,523,2048,8597,38486,182905,
 919146,4866871,27068420,157693007,959873708,
 6091057009,40213034874,275699950381,1959625294310,
 14418124498211,109655727901592,860946822538675,
 6969830450679864,58114638923638573]