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A056320 as a simple table

n a(n)
1 0
2 0
3 0
4 12
5 120
6 780
7 4212
8 20412
9 93360
10 409260
11 1749780
12 7338000
13 30394560
14 124700928
15 508291692
16 2061586800
17 8332140720
18 33585682920
19 135116412660
20 542785390680
21 2178110585388
22 8733343485120

[0,0,0,12,120,780,4212,20412,93360,409260,1749780,
 7338000,30394560,124700928,508291692,2061586800,
 8332140720,33585682920,135116412660,542785390680,
 2178110585388,8733343485120]

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Last modified August 25 05:19 EDT 2019. Contains 326318 sequences. (Running on oeis4.)