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A209969 as a simple table

n a(n)
1 0
2 0
3 0
4 9
5 26
6 9
7 162
8 665
9 665
10 162
11 1845
12 13529
13 25435
14 13529
15 1845
16 17262
17 235614
18 870686
19 870686
20 235614
21 17262
22 144945
23 3745144
24 27112487
25 53890394
26 27112487
27 3745144
28 144945
29 1138194
30 56080379
31 795773818
32 3143493049
33 3143493049

[0,0,0,9,26,9,162,665,665,162,1845,13529,25435,
 13529,1845,17262,235614,870686,870686,235614,
 17262,144945,3745144,27112487,53890394,27112487,
 3745144,144945,1138194,56080379,795773818,
 3143493049,3143493049]

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Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)