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A138543 as a simple table

n a(n)
0 1
1 0
2 3
3 0
4 26
5 0
6 345
7 0
8 5754
9 0
10 110586
11 0
12 2341548
13 0
14 53208441
15 0
16 1276027610
17 0
18 31930139670
19 0
20 826963069140
21 0
22 22035414489270
23 0
24 601361536493340
25 0
26 16749316314679500
27 0
28 474777481850283240
29 0
30 13665774112508864385
31 0

[1,0,3,0,26,0,345,0,5754,0,110586,0,2341548,0,
 53208441,0,1276027610,0,31930139670,0,
 826963069140,0,22035414489270,0,601361536493340,0,
 16749316314679500,0,474777481850283240,0,
 13665774112508864385,0]

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Last modified September 26 00:10 EDT 2023. Contains 365649 sequences. (Running on oeis4.)