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A172724 as a simple table

n a(n)
1 0
2 0
3 21
4 20112
5 84202220
6 1070625363840
7 36012988082548233
8 2867622077261705078784
9 494207026605606690167323392
10 171330275896315127362166522313600

[0,0,21,20112,84202220,1070625363840,
 36012988082548233,2867622077261705078784,
 494207026605606690167323392,
 171330275896315127362166522313600]

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)