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A297707 as a simple table

na(n)
11
22
318
4768
590000
644789760
730494620800
8121762322841600
9393644011735296000
105618427494400000000000
11107587910030480590233600000
125951222311476064581656248320000
13176804782652901880753915871232000000
1469819090744423637487544223697731584000000

[1,2,18,768,90000,44789760,30494620800,
 121762322841600,393644011735296000,
 5618427494400000000000,
 107587910030480590233600000,
 5951222311476064581656248320000,
 176804782652901880753915871232000000,
 69819090744423637487544223697731584000000]