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A057500 as a simple table

n a(n)
1 0
2 0
3 1
4 15
5 222
6 3660
7 68295
8 1436568
9 33779340
10 880107840
11 25201854045
12 787368574080
13 26667815195274
14 973672928417280
15 38132879409281475
16 1594927540549217280
17 70964911709203684440
18 3347306760024413356032
19 166855112441313024389625
20 8765006377126199463936000

[0,0,1,15,222,3660,68295,1436568,33779340,
 880107840,25201854045,787368574080,26667815195274,
 973672928417280,38132879409281475,
 1594927540549217280,70964911709203684440,
 3347306760024413356032,166855112441313024389625,
 8765006377126199463936000]

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)