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A180222 as a simple table

n a(n)
1 0
2 1
3 4
4 24
5 128
6 704
7 3840
8 20992
9 114688
10 626688
11 3424256
12 18710528
13 102236160
14 558628864
15 3052404736
16 16678649856
17 91133837312
18 497964548096
19 2720928890880
20 14867431948288
21 81237158920192
22 443888091267072
23 2425449636429824
24 13252903275855872

[0,1,4,24,128,704,3840,20992,114688,626688,
 3424256,18710528,102236160,558628864,3052404736,
 16678649856,91133837312,497964548096,
 2720928890880,14867431948288,81237158920192,
 443888091267072,2425449636429824,
 13252903275855872]

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Last modified April 24 17:02 EDT 2024. Contains 371962 sequences. (Running on oeis4.)