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A243585 as a simple table

n a(n)
0 1
1 4
2 20
3 106
4 580
5 3244
6 18446
7 106250
8 618340
9 3628600
10 21438820
11 127377980
12 760346350
13 4556473276
14 27396081950
15 165189725326
16 998492094244
17 6048338850560
18 36706629690824
19 223139239595840
20 1358475322091620

[1,4,20,106,580,3244,18446,106250,618340,3628600,
 21438820,127377980,760346350,4556473276,
 27396081950,165189725326,998492094244,
 6048338850560,36706629690824,223139239595840,
 1358475322091620]

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)