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A001755 as a simple table

na(n)
41
520
6300
74200
858800
9846720
1012700800
11199584000
123293136000
1357081024000
141038874636800
1519833061248000
16396661224960000
178299373322240000
18181400588328960000
194135933413900288000
2098228418580131840000
212426819753156198400000
2262288373664342425600000

[1,20,300,4200,58800,846720,12700800,199584000,
 3293136000,57081024000,1038874636800,
 19833061248000,396661224960000,8299373322240000,
 181400588328960000,4135933413900288000,
 98228418580131840000,2426819753156198400000,
 62288373664342425600000]