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A145981 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 497
12 2485
13 47570
14 166495
15 5084310
16 13219206
17 154102305
18 308204610
19 1710651635
20 2688166855
21 7377935180
22 9222418975
23 12879738244
24 12879738244
25 9222418975
26 7377935180
27 2688166855

[1,0,0,0,0,0,0,0,0,0,0,497,2485,47570,166495,
 5084310,13219206,154102305,308204610,1710651635,
 2688166855,7377935180,9222418975,12879738244,
 12879738244,9222418975,7377935180,2688166855]

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Last modified March 25 20:10 EDT 2019. Contains 321477 sequences. (Running on oeis4.)