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A361609 as a simple table

n a(n)
0 1
1 20
2 180
3 1264
4 7808
5 44544
6 240640
7 1249280
8 6291456
9 30932992
10 149159936
11 707788800
12 3313500160
13 15334375424
14 70262980608
15 319169757184
16 1438814044160
17 6442450944000
18 28673201668096
19 126924873531392
20 559101662724096
21 2451910929940480
22 10709243254538240
23 46601700831657984

[1,20,180,1264,7808,44544,240640,1249280,6291456,
 30932992,149159936,707788800,3313500160,
 15334375424,70262980608,319169757184,
 1438814044160,6442450944000,28673201668096,
 126924873531392,559101662724096,2451910929940480,
 10709243254538240,46601700831657984]

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Last modified May 21 19:35 EDT 2024. Contains 372738 sequences. (Running on oeis4.)