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A271565 as a simple table

n a(n)
1 0
2 0
3 0
4 2
5 28
6 394
7 6812
8 128810
9 2918020
10 83120450
11 2524575200
12 91589444450
13 3682730287600
14 155231331960250
15 7156139793803000
16 372520258834974250
17 21613446896458917500
18 1296556574981939521250
19 85520460088068245240000
20 5980843188551617897761250
21 430093937447553491544932500

[0,0,0,2,28,394,6812,128810,2918020,83120450,
 2524575200,91589444450,3682730287600,
 155231331960250,7156139793803000,
 372520258834974250,21613446896458917500,
 1296556574981939521250,85520460088068245240000,
 5980843188551617897761250,
 430093937447553491544932500]

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)