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A242530 as a simple table

n a(n)
1 0
2 0
3 1
4 0
5 2
6 8
7 0
8 0
9 224
10 754
11 0
12 26256
13 0
14 0
15 22472304
16 0
17 90654576
18 277251016
19 0
20 7852128780

[0,0,1,0,2,8,0,0,224,754,0,26256,0,0,22472304,0,
 90654576,277251016,0,7852128780]

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Last modified January 16 21:37 EST 2019. Contains 319206 sequences. (Running on oeis4.)