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A038154 as a simple table

n a(n)
0 0
1 0
2 2
3 12
4 60
5 320
6 1950
7 13692
8 109592
9 986400
10 9864090
11 108505100
12 1302061332
13 16926797472
14 236975164790
15 3554627472060
16 56874039553200
17 966858672404672
18 17403456103284402
19 330665665962403980
20 6613313319248079980
21 138879579704209680000

[0,0,2,12,60,320,1950,13692,109592,986400,9864090,
 108505100,1302061332,16926797472,236975164790,
 3554627472060,56874039553200,966858672404672,
 17403456103284402,330665665962403980,
 6613313319248079980,138879579704209680000]

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Last modified March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)