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A351733 as a simple table

n a(n)
0 1
1 0
2 4
3 6
4 56
5 250
6 1812
7 12614
8 101040
9 864882
10 7988780
11 78726142
12 823897032
13 9111774698
14 106068603396
15 1295153135670
16 16538681229152
17 220281968528098
18 3053087839536732
19 43941561067048430
20 655501502129291640
21 10118103843683127642

[1,0,4,6,56,250,1812,12614,101040,864882,7988780,
 78726142,823897032,9111774698,106068603396,
 1295153135670,16538681229152,220281968528098,
 3053087839536732,43941561067048430,
 655501502129291640,10118103843683127642]

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Last modified September 5 00:56 EDT 2024. Contains 375685 sequences. (Running on oeis4.)