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A066053 as a simple table

na(n)
01
16
236
3236
41686
513028
6108078
7956348
88976708
988962160
10927129786
1110125636716
12115543526476
131373933166848
1416985192456410
15217851008508220
162893517713599370
1739732264695056772
18563187218351672330
198229159647194683140
20123795221970087313340

[1,6,36,236,1686,13028,108078,956348,8976708,
 88962160,927129786,10125636716,115543526476,
 1373933166848,16985192456410,217851008508220,
 2893517713599370,39732264695056772,
 563187218351672330,8229159647194683140,
 123795221970087313340]