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A061720 as a simple table

n a(n)
0 1
1 4
2 24
3 180
4 2100
5 27720
6 480480
7 9189180
8 213393180
9 6246600360
10 194090796900
11 7220177644680
12 296829525392400
13 12778511068142820
14 601807021256821380
15 31974268694601553320
16 1890171191677022594340
17 115365621009252758344200
18 7741033169720860084895820

[1,4,24,180,2100,27720,480480,9189180,213393180,
 6246600360,194090796900,7220177644680,
 296829525392400,12778511068142820,
 601807021256821380,31974268694601553320,
 1890171191677022594340,115365621009252758344200,
 7741033169720860084895820]

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Last modified March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)