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A269773 as a simple table

na(n)
16
236
3216
41290
57680
645600
7270150
81597500
99432000
1055616250
11327585000
121927725000
1311335143750
1466607312500
15391177125000
162296246406250
1713473738750000
1879033031250000
19463449377343750
202716989679687500

[6,36,216,1290,7680,45600,270150,1597500,9432000,
 55616250,327585000,1927725000,11335143750,
 66607312500,391177125000,2296246406250,
 13473738750000,79033031250000,463449377343750,
 2716989679687500]