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A145789 as a simple table

na(n)
11
21
31
415
589
6904
710469
8202299
96253788
10295345323
1120297903190
122062672356086
13313264131593508

[1,1,1,15,89,904,10469,202299,6253788,295345323,
 20297903190,2062672356086,313264131593508]