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A293857 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 12
5 36
6 144
7 1440
8 9216
9 66240
10 504000
11 7344000
12 73612800
13 830995200
14 9373190400
15 181875456000
16 2474319052800
17 38246274662400
18 572552876851200
19 13783143886848000
20 237527801118720000
21 4658378696294400000
22 86818505051013120000
23 2488457229932298240000

[1,1,1,4,12,36,144,1440,9216,66240,504000,7344000,
 73612800,830995200,9373190400,181875456000,
 2474319052800,38246274662400,572552876851200,
 13783143886848000,237527801118720000,
 4658378696294400000,86818505051013120000,
 2488457229932298240000]

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Last modified August 15 00:19 EDT 2024. Contains 375171 sequences. (Running on oeis4.)