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A270531 as a simple table

n a(n)
0 0
1 0
2 1
3 2
4 30
5 744
6 403320
7 482631120
8 22230943262640
9 2439304469060699520
10 16131709536027319923050880
11 265557748777251180632423132716800
12 382326737887135184960649117960539544556800
13 1405822033408121123332642294795422193345577766681600

[0,0,1,2,30,744,403320,482631120,22230943262640,
 2439304469060699520,16131709536027319923050880,
 265557748777251180632423132716800,
 382326737887135184960649117960539544556800,
 14058220334081211233326422947954221933455777666816\
 00]

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Last modified May 23 20:23 EDT 2019. Contains 323528 sequences. (Running on oeis4.)