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A231798 as a simple table

na(n)
15
261
31699
4157633
555365917
649517022951
7136680218773938
81238966901352323684
933422575469205248761449
102727001865924519366481416822

[5,61,1699,157633,55365917,49517022951,
 136680218773938,1238966901352323684,
 33422575469205248761449,
 2727001865924519366481416822]