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A099857 as a simple table

na(n)
01
16
218
348
4126
5330
6864
72262
85922
915504
1040590
11106266
12278208
13728358
141906866
154992240
1613069854
1734217322
1889582112
19234529014
20614004930
211607485776
224208452398
2311017871418
2428845161856
2575517614150
26197707680594

[1,6,18,48,126,330,864,2262,5922,15504,40590,
 106266,278208,728358,1906866,4992240,13069854,
 34217322,89582112,234529014,614004930,1607485776,
 4208452398,11017871418,28845161856,75517614150,
 197707680594]