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A097831 as a simple table

na(n)
01
118
2306
35185
487840
51488096
625209793
7427078386
87235122770
9122570008705
102076455025216
1135177165419968
12595935357114241
1310095723905522130
14171031371036761970
152897437583719431361
1649085407552193571168

[1,18,306,5185,87840,1488096,25209793,427078386,
 7235122770,122570008705,2076455025216,
 35177165419968,595935357114241,10095723905522130,
 171031371036761970,2897437583719431361,
 49085407552193571168]