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A120052
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
7
5
138
6
1878
7
23448
8
279286
9
3230577
10
36585097
11
407818620
12
4490844534
13
48972151631
14
529781669333
[0,0,0,0,7,138,1878,23448,279286,3230577,36585097, 407818620,4490844534,48972151631,529781669333]
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Last modified May 23 05:54 EDT 2024. Contains 372758 sequences. (Running on oeis4.)