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A234854 as a simple table

n a(n)
1 1
2 4
3 18
4 96
5 624
6 4896
7 45072
8 474624
9 5619456
10 73903104
11 1069106688
12 16872800256
13 288483876864
14 5311773904896
15 104789944829952
16 2205099306123264
17 49302137885884416
18 1167150882577711104
19 29165495002777387008
20 767163772371852066816
21 21188300138891474632704

[1,4,18,96,624,4896,45072,474624,5619456,73903104,
 1069106688,16872800256,288483876864,5311773904896,
 104789944829952,2205099306123264,
 49302137885884416,1167150882577711104,
 29165495002777387008,767163772371852066816,
 21188300138891474632704]

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Last modified August 16 05:55 EDT 2022. Contains 356160 sequences. (Running on oeis4.)