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A081188 as a simple table

na(n)
01
16
237
3234
41513
59966
666637
7450834
83077713
921153366
10146120437
111013077434
127042713913
1349054856766
14342163294237
152389039544034
1616692759230113
17116696726720166
18816114147588037
195708984335850634

[1,6,37,234,1513,9966,66637,450834,3077713,
 21153366,146120437,1013077434,7042713913,
 49054856766,342163294237,2389039544034,
 16692759230113,116696726720166,816114147588037,
 5708984335850634]