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A097999 as a simple table

na(n)
31
49
5132
62700
770920
82275560
986264640
103772681920
11186972105600
1210355595465600
13633892275878400
1442495895579737600
153096545573029708800
16243680880958010496000
1720596410256606119936000
181860881636529774802944000
19178975197401013144907776000
2018256461815785805072068608000

[1,9,132,2700,70920,2275560,86264640,3772681920,
 186972105600,10355595465600,633892275878400,
 42495895579737600,3096545573029708800,
 243680880958010496000,20596410256606119936000,
 1860881636529774802944000,
 178975197401013144907776000,
 18256461815785805072068608000]