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A012594 as a simple table

n a(n)
0 1
1 0
2 1
3 6
4 25
5 140
6 1225
7 11410
8 110353
9 1260696
10 16597745
11 233501598
12 3534940649
13 58867014180
14 1060745261433
15 20315286728490
16 414362268698017
17 9016753267197744
18 207836963025430369
19 5046234392527982902

[1,0,1,6,25,140,1225,11410,110353,1260696,
 16597745,233501598,3534940649,58867014180,
 1060745261433,20315286728490,414362268698017,
 9016753267197744,207836963025430369,
 5046234392527982902]

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Last modified August 14 04:13 EDT 2020. Contains 336477 sequences. (Running on oeis4.)