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A242527 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 1
6 1
7 2
8 6
9 6
10 22
11 80
12 504
13 840
14 6048
15 3888
16 37524
17 72976
18 961776
19 661016
20 11533030
21 7544366
22 133552142
23 208815294
24 5469236592
25 6429567323
26 153819905698
27 182409170334
28 4874589558919
29 7508950009102
30 209534365631599

[0,0,0,0,1,1,2,6,6,22,80,504,840,6048,3888,37524,
 72976,961776,661016,11533030,7544366,133552142,
 208815294,5469236592,6429567323,153819905698,
 182409170334,4874589558919,7508950009102,
 209534365631599]

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Last modified November 14 10:04 EST 2019. Contains 329111 sequences. (Running on oeis4.)