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A301997 as a simple table

na(n)
15
250
3309
42036
514016
6100176
7729297
85333386
939000114
10285003038
112082142574
1215211180773
13111130989409
14811933398770
155932115487834
1643341007947078
17316656251375882
182313539966133653
1916903085362643740
20123496604929203700

[5,50,309,2036,14016,100176,729297,5333386,
 39000114,285003038,2082142574,15211180773,
 111130989409,811933398770,5932115487834,
 43341007947078,316656251375882,2313539966133653,
 16903085362643740,123496604929203700]