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A375639 as a simple table

na(n)
01
10
20
312
424
580
62520
717136
8124320
92462400
1030965760
11372113280
127014807360
13122840789760
142078973921024
1543236813312000
16932206147891200
1720090534745415680
18480054835899371520
1912126262777282805760
20313198020852233932800

[1,0,0,12,24,80,2520,17136,124320,2462400,
 30965760,372113280,7014807360,122840789760,
 2078973921024,43236813312000,932206147891200,
 20090534745415680,480054835899371520,
 12126262777282805760,313198020852233932800]