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A252888 as a simple table

na(n)
10
21
318
4386
512200
6608993
749489706
86648891794
91489334202216
10558938851118771
11352470525557050186
12374131713336300308700
13669158287926101914730400
142017974751792892883550074600

[0,1,18,386,12200,608993,49489706,6648891794,
 1489334202216,558938851118771,352470525557050186,
 374131713336300308700,669158287926101914730400,
 2017974751792892883550074600]