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A174075 as a simple table

na(n)
31
46
518
693
7600
84320
935168
10321630
113257109
1236199458
13438126986
145736774869
1580808984725
161218563192160
1719587031966352
18334329804180135
196039535339644630
20115118210695441900
212308967760171049528
2248613722701440862328
231072008447320752890459

[1,6,18,93,600,4320,35168,321630,3257109,36199458,
 438126986,5736774869,80808984725,1218563192160,
 19587031966352,334329804180135,6039535339644630,
 115118210695441900,2308967760171049528,
 48613722701440862328,1072008447320752890459]