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A246531 as a simple table

na(n)
01
11
24
318
4224
51320
642552
7262864
812232320
9169594560
106117023600
1161920993024
128022787347456
1356694391376896
145193025319432160
15174746314698336000
1610338252997184749568
17121439552019384139776
1826096843176349347142208
19262144006402373705728000

[1,1,4,18,224,1320,42552,262864,12232320,
 169594560,6117023600,61920993024,8022787347456,
 56694391376896,5193025319432160,
 174746314698336000,10338252997184749568,
 121439552019384139776,26096843176349347142208,
 262144006402373705728000]