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A098625 as a simple table

n a(n)
0 1
1 0
2 2
3 4
4 39
5 228
6 2400
7 23616
8 307692
9 4197408
10 67658769
11 1174316570
12 22916090131
13 482946085932

[1,0,2,4,39,228,2400,23616,307692,4197408,
 67658769,1174316570,22916090131,482946085932]

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)