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A075147 as a simple table

na(n)
11
21
38
460
5624
67735
7117648
82096640
943046640
10999989991
1125937424600
12743008120140
1323298085122480
14793714765724595
1529192926025339776
161152921504338411520
1748661191875666868480
182185911559727674682148
19104127350297911241532840
205242879999999487999992020

[1,1,8,60,624,7735,117648,2096640,43046640,
 999989991,25937424600,743008120140,23298085122480,
 793714765724595,29192926025339776,
 1152921504338411520,48661191875666868480,
 2185911559727674682148,104127350297911241532840,
 5242879999999487999992020]