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A081972 as a simple table

n a(n)
1 1
2 1
3 4
4 34
5 528
6 16644
7 1056832
8 134744072
9 34426978560
10 17609382707216
11 18023198899569664
12 36902497546234101792
13 151134176447977081540608
14 1238015601761073699807559744
15 20283028592561355523908308058112

[1,1,4,34,528,16644,1056832,134744072,34426978560,
 17609382707216,18023198899569664,
 36902497546234101792,151134176447977081540608,
 1238015601761073699807559744,
 20283028592561355523908308058112]

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)