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A068718 as a simple table

na(n)
01
12
22
32
48
525
690
7404
82055
911792
1075053
11525622
124015361
1333231679
14296182315
152828335731
1628809181418
17311788442591
183572832236720
1943216177809190
20550245463265240
217356239983352887
22103028812072639378

[1,2,2,2,8,25,90,404,2055,11792,75053,525622,
 4015361,33231679,296182315,2828335731,28809181418,
 311788442591,3572832236720,43216177809190,
 550245463265240,7356239983352887,
 103028812072639378]