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A009159 as a simple table

n a(n)
0 1
1 0
2 4
3 56
4 1744
5 86208
6 6199744
7 608357504
8 77889982720
9 12588540708864
10 2503565961032704
11 600347512023062528
12 170721835772956659712
13 56780394898390577528832
14 21828678118361789793746944

[1,0,4,56,1744,86208,6199744,608357504,
 77889982720,12588540708864,2503565961032704,
 600347512023062528,170721835772956659712,
 56780394898390577528832,
 21828678118361789793746944]

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Last modified July 7 15:49 EDT 2020. Contains 335495 sequences. (Running on oeis4.)