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A246610 as a simple table

n a(n)
0 1
1 0
2 0
3 2
4 24
5 300
6 4480
7 78750
8 1591296
9 36355256
10 927244800
11 26127386010
12 806251494400
13 27046291980708
14 980094896062464
15 38158333538165750
16 1588601646620835840
17 70427042234715548400
18 3312574102411273437184
19 164767312911755127462066
20 8641342923227371929600000

[1,0,0,2,24,300,4480,78750,1591296,36355256,
 927244800,26127386010,806251494400,27046291980708,
 980094896062464,38158333538165750,
 1588601646620835840,70427042234715548400,
 3312574102411273437184,164767312911755127462066,
 8641342923227371929600000]

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Last modified May 19 11:43 EDT 2022. Contains 353833 sequences. (Running on oeis4.)