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A180067 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 28
7 81095
8 42752576
9 2436444603
10 53633024900
11 666519047964
12 5655962632720
13 36502953719310
14 191587564345044
15 854990702601025
16 3346890268570368
17 11756179090049177
18 37692541754516628
19 111774885566128630
20 309788198526691600

[0,0,0,0,0,28,81095,42752576,2436444603,
 53633024900,666519047964,5655962632720,
 36502953719310,191587564345044,854990702601025,
 3346890268570368,11756179090049177,
 37692541754516628,111774885566128630,
 309788198526691600]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)