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A269902 as a simple table

n a(n)
1 0
2 7
3 7
4 84
5 840
6 84
7 756
8 45360
9 45360
10 756
11 6048
12 2005080
13 12377400
14 2005080
15 6048
16 45360
17 80724000
18 2801265390
19 2801265390
20 80724000
21 45360
22 326592
23 3078006120
24 579818225700
25 3263186052840
26 579818225700
27 3078006120
28 326592
29 2286144

[0,7,7,84,840,84,756,45360,45360,756,6048,2005080,
 12377400,2005080,6048,45360,80724000,2801265390,
 2801265390,80724000,45360,326592,3078006120,
 579818225700,3263186052840,579818225700,
 3078006120,326592,2286144]

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Last modified January 19 15:37 EST 2020. Contains 331049 sequences. (Running on oeis4.)