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A273053 as a simple table

n a(n)
1 0
2 4
3 32
4 252
5 1984
6 15620
7 122976
8 968188
9 7622528
10 60012036
11 472473760
12 3719778044
13 29285750592
14 230566226692
15 1815244062944
16 14291386276860
17 112515846151936
18 885835382938628
19 6974167217357088
20 54907502355918076
21 432285851629987520
22 3403379310683982084

[0,4,32,252,1984,15620,122976,968188,7622528,
 60012036,472473760,3719778044,29285750592,
 230566226692,1815244062944,14291386276860,
 112515846151936,885835382938628,6974167217357088,
 54907502355918076,432285851629987520,
 3403379310683982084]

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Last modified July 29 15:22 EDT 2021. Contains 346346 sequences. (Running on oeis4.)