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A168306 as a simple table

na(n)
5105
66534
7132444
81593960
913962848
1098382912
11590814336
123137815296
1315114950400
1467240622592
15279977837568
161102376491008
174137416245248
1814896905748480
1951722619518976
20173913487048704
21568323403481088
221810359422681088
235635647921192960

[105,6534,132444,1593960,13962848,98382912,
 590814336,3137815296,15114950400,67240622592,
 279977837568,1102376491008,4137416245248,
 14896905748480,51722619518976,173913487048704,
 568323403481088,1810359422681088,5635647921192960]