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A255378 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 1
9 18
10 261
11 3420
12 42300
13 504000
14 5850000
15 66600000
16 747000000
17 8279999991
18 90899999757
19 989999995383
20 10709999925399
21 115199998904070
22 1232999984885400
23 13139999800740000
24 139499997460650000
25 1475999968482900000
26 15569999617032000081

[0,0,0,0,0,0,0,0,1,18,261,3420,42300,504000,
 5850000,66600000,747000000,8279999991,90899999757,
 989999995383,10709999925399,115199998904070,
 1232999984885400,13139999800740000,
 139499997460650000,1475999968482900000,
 15569999617032000081]

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Last modified May 4 08:39 EDT 2024. Contains 372230 sequences. (Running on oeis4.)