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A225681 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 4
9 24
10 92
11 292
12 850
13 2276
14 5766
15 13968
16 32690
17 74368
18 165442
19 361104
20 776116
21 1646566
22 3456030
23 7189232
24 14844878
25 30464914

[0,0,0,0,0,0,0,0,4,24,92,292,850,2276,5766,13968,
 32690,74368,165442,361104,776116,1646566,3456030,
 7189232,14844878,30464914]

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Last modified August 5 21:56 EDT 2020. Contains 336213 sequences. (Running on oeis4.)