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A305689 as a simple table

na(n)
13
2383
38415
4236246
56433903
6175572754
74791219558
8130750175963
93568076221953
1097370309875185
112657167978118536
1272512261986547460
131978809088409099730
1454000320827193482794
151473631117958521017183

[3,383,8415,236246,6433903,175572754,4791219558,
 130750175963,3568076221953,97370309875185,
 2657167978118536,72512261986547460,
 1978809088409099730,54000320827193482794,
 1473631117958521017183]