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A337886 as a simple table

na(n)
21
32
41
53
65
71
84
915
1028
111
125
1334
14387
15768
161
176
1865
192784
20202203
21302032
221
237
24111
2513125
2611230976
277109211078
283098988832
291
308
31175
3246836
33254729375
349393953524224
3550669807706182691
361831011525739328
371

[1,2,1,3,5,1,4,15,28,1,5,34,387,768,1,6,65,2784,
 202203,302032,1,7,111,13125,11230976,7109211078,
 3098988832,1,8,175,46836,254729375,9393953524224,
 50669807706182691,1831011525739328,1]