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A081054 as a simple table

n a(n)
0 1
1 0
2 1
3 4
4 31
5 288
6 3272
7 43580
8 666143
9 11491696
10 220875237
11 4681264432
12 108475235444
13 2728591657920
14 74051386322580
15 2156865088819692
16 67113404608820943
17 2221948578439255200
18 77990056655776149179

[1,0,1,4,31,288,3272,43580,666143,11491696,
 220875237,4681264432,108475235444,2728591657920,
 74051386322580,2156865088819692,67113404608820943,
 2221948578439255200,77990056655776149179]

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Last modified February 24 02:48 EST 2020. Contains 332195 sequences. (Running on oeis4.)