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A223871 as a simple table

na(n)
150
22500
399223
43863372
5152918517
66066668157
7240345697904
89519219712534
9377068749332794
1014936662560715369
11591673197324653702
1223437360043162717039
13928401612451857089159
1436775894520547706164712

[50,2500,99223,3863372,152918517,6066668157,
 240345697904,9519219712534,377068749332794,
 14936662560715369,591673197324653702,
 23437360043162717039,928401612451857089159,
 36775894520547706164712]