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A248087 as a simple table

n a(n)
0 0
1 0
2 1
3 0
4 0
5 20
6 105
7 504
8 4480
9 43560
10 424305
11 4613840
12 55668096
13 724667580
14 10136511385
15 152029000200
16 2432747715840
17 41357024915024
18 744416488494945
19 14143911946532640
20 282878618744592640
21 5940450667217358180
22 130689899053015493961
23 3005867708207562586520

[0,0,1,0,0,20,105,504,4480,43560,424305,4613840,
 55668096,724667580,10136511385,152029000200,
 2432747715840,41357024915024,744416488494945,
 14143911946532640,282878618744592640,
 5940450667217358180,130689899053015493961,
 3005867708207562586520]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)