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A275568 as a simple table

n a(n)
1 12
2 864
3 1872
4 4056
5 13104
6 42336
7 138600
8 453750
9 1506450
10 5001414
11 16784592
12 56328576
13 190035408
14 641121414
15 2165870262
16 7316857446
17 24718829850
18 83508603750
19 282120696000
20 953100441600
21 3220293856320
22 10880587258614

[12,864,1872,4056,13104,42336,138600,453750,
 1506450,5001414,16784592,56328576,190035408,
 641121414,2165870262,7316857446,24718829850,
 83508603750,282120696000,953100441600,
 3220293856320,10880587258614]

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Last modified October 24 19:55 EDT 2020. Contains 338009 sequences. (Running on oeis4.)