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A168595 as a simple table

na(n)
01
14
236
3358
43748
540404
6443886
74941654
855555236
9629285416
107170731236
1182108083204
12943960439086
1310889085499348
14125974782200478
151461030555025458
1616981658850393252
17197757344280343968

[1,4,36,358,3748,40404,443886,4941654,55555236,
 629285416,7170731236,82108083204,943960439086,
 10889085499348,125974782200478,1461030555025458,
 16981658850393252,197757344280343968]