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A007657 as a simple table

na(n)
11
22
36
436
5270
62520
728560
8361200
95481000
1088565400
111654052400
1232885455680
13721400359680
1417024709461760
15429108154675200
1611721695953968000
17333806974560259200
1810358856500289897600
19331148326165228091520
2011429645706428485536000
21407641141014720316704000

[1,2,6,36,270,2520,28560,361200,5481000,88565400,
 1654052400,32885455680,721400359680,
 17024709461760,429108154675200,11721695953968000,
 333806974560259200,10358856500289897600,
 331148326165228091520,11429645706428485536000,
 407641141014720316704000]