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A246531 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 224
5 1320
6 42552
7 262864
8 12232320
9 169594560
10 6117023600
11 61920993024
12 8022787347456
13 56694391376896
14 5193025319432160
15 174746314698336000
16 10338252997184749568
17 121439552019384139776
18 26096843176349347142208
19 262144006402373705728000

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

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Last modified June 23 11:29 EDT 2021. Contains 345397 sequences. (Running on oeis4.)