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A261516 as a simple table

n a(n)
0 1
1 1
2 0
3 0
4 0
5 2
6 0
7 18
8 66
9 382
10 1104
11 4138
12 15324
13 61644
14 325456
15 2320948
16 17660110
17 148271962
18 1171109228
19 9257051746 

[1,1,0,0,0,2,0,18,66,382,1104,4138,15324,61644,
 325456,2320948,17660110,148271962,1171109228,
 9257051746]

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Last modified April 17 22:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)