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A168940 as a simple table

na(n)
01
123
2506
311132
4244904
55387888
6118533536
72607737792
857370231424
91262145091328
1027767192009216
11610878224202752
1213439320932460544
13295665060514131968
146504631331310903296
15143101889288839872512

[1,23,506,11132,244904,5387888,118533536,
 2607737792,57370231424,1262145091328,
 27767192009216,610878224202752,13439320932460544,
 295665060514131968,6504631331310903296,
 143101889288839872512]