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A306091 as a simple table

na(n)
11
22
34
46
58
61440
7960
8120960
948384
107257600
111612800
12479001600
134561920
145230697472000
1510461394944000
167846046208000
176974263296000
189146248151040000
198536498274304000
201502674769756160000
211857852442607616000
2267440043666656460800000
2344960029111104307200000
2418613452051997183180800000
25954536002666522214400000

[1,2,4,6,8,1440,960,120960,48384,7257600,1612800,
 479001600,4561920,5230697472000,10461394944000,
 7846046208000,6974263296000,9146248151040000,
 8536498274304000,1502674769756160000,
 1857852442607616000,67440043666656460800000,
 44960029111104307200000,
 18613452051997183180800000,
 954536002666522214400000]