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A288637 as a simple table

na(n)
16
240
3213
41049
55034
623984
7114069
8542295
92577870
1012253948
1158249011
12276885683
131316170990
146256394122
1529739651711
16141366874247
17671984773580
183194266961582
1915183887824311
2072176324719925
21343088799809408
221630866146364842
237752291502484181

[6,40,213,1049,5034,23984,114069,542295,2577870,
 12253948,58249011,276885683,1316170990,6256394122,
 29739651711,141366874247,671984773580,
 3194266961582,15183887824311,72176324719925,
 343088799809408,1630866146364842,7752291502484181]