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A214916 as a simple table

na(n)
01
11
22
36
412
520
660
7252
8672
91440
105400
1127720
1288704
13224640
14982800
155821200
1621288960
1761102080
18300736800
191990850400
208089804800
2125662873600
22138940401600
231007370302400
244465572249600
2515397724160000
2690311261040000
27707173952284800
283375972620697600

[1,1,2,6,12,20,60,252,672,1440,5400,27720,88704,
 224640,982800,5821200,21288960,61102080,300736800,
 1990850400,8089804800,25662873600,138940401600,
 1007370302400,4465572249600,15397724160000,
 90311261040000,707173952284800,3375972620697600]