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A180187 as a simple table

n a(n)
1 0
2 1
3 0
4 3
5 14
6 72
7 468
8 3453
9 28782
10 267831
11 2752828
12 30984336
13 379125192
14 5011756625
15 71190365580
16 1081514329155
17 17499480412746
18 300473929597320
19 5457031426340748
20 104520033700333069
21 2105651342251571562

[0,1,0,3,14,72,468,3453,28782,267831,2752828,
 30984336,379125192,5011756625,71190365580,
 1081514329155,17499480412746,300473929597320,
 5457031426340748,104520033700333069,
 2105651342251571562]

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Last modified June 4 16:53 EDT 2020. Contains 334828 sequences. (Running on oeis4.)