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A309900 as a simple table

na(n)
00
11
24
313
467
5229
6229
7958
8958
97519
1027202
1127202
12204349
131267231
141267231
1510833169
1639530983
17125624425
18125624425
19125624425
201287885892
214774670293
2215235023496
2346616083105
24140759261932
25140759261932
26988047871375
273529913699704
2811155511184691

[0,1,4,13,67,229,229,958,958,7519,27202,27202,
 204349,1267231,1267231,10833169,39530983,
 125624425,125624425,125624425,1287885892,
 4774670293,15235023496,46616083105,140759261932,
 140759261932,988047871375,3529913699704,
 11155511184691]