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A218653 as a simple table

n a(n)
0 1
1 1
2 4
3 27
4 264
5 3400
6 54480
7 1045800
8 23412480
9 599157216
10 17258814720
11 552733695360
12 19485393903360
13 749871707270400
14 31283408387911680
15 1406370859616923200
16 67780975948945459200
17 3486485719168394342400
18 190644828634476331315200
19 11043310871932837194977280

[1,1,4,27,264,3400,54480,1045800,23412480,
 599157216,17258814720,552733695360,19485393903360,
 749871707270400,31283408387911680,
 1406370859616923200,67780975948945459200,
 3486485719168394342400,190644828634476331315200,
 11043310871932837194977280]

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Last modified September 20 17:42 EDT 2021. Contains 347588 sequences. (Running on oeis4.)