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A187171 as a simple table

n a(n)
1 0
2 0
3 414912
4 6654048
5 30938640
6 85654320
7 181790352
8 330218544
9 541990896
10 828222216
11 1200035436
12 1668553872
13 2244900840
14 2940199656
15 3765573636
16 4732146096
17 5851040352
18 7133379720
19 8590287516
20 10232887056
21 12072301656

[0,0,414912,6654048,30938640,85654320,181790352,
 330218544,541990896,828222216,1200035436,
 1668553872,2244900840,2940199656,3765573636,
 4732146096,5851040352,7133379720,8590287516,
 10232887056,12072301656]

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Last modified December 7 18:04 EST 2023. Contains 367660 sequences. (Running on oeis4.)