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A121355 as a simple table

na(n)
11
21
38
448
5120
62640
730240
8201600
94838400
1096163200
111037836800
1230496435200
13828193766400
1413686991718400
15450537408921600
1615880397524992000
17356398802952192000
1813410127414075392000
19569542360114151424000
2016614774394239909888000

[1,1,8,48,120,2640,30240,201600,4838400,96163200,
 1037836800,30496435200,828193766400,
 13686991718400,450537408921600,15880397524992000,
 356398802952192000,13410127414075392000,
 569542360114151424000,16614774394239909888000]