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A318615 as a simple table

n a(n)
0 1
1 0
2 4
3 9
4 224
5 1650
6 38664
7 540960
8 13930496
9 291769128
10 8598924000
11 237964577400
12 8082061452288
13 275311724996880
14 10714824398213376
15 430458433091505000
16 19007133744632954880
17 876046954673290438080
18 43416883192646088235008
19 2252711496770428822876800
20 124040138653975179571200000

[1,0,4,9,224,1650,38664,540960,13930496,291769128,
 8598924000,237964577400,8082061452288,
 275311724996880,10714824398213376,
 430458433091505000,19007133744632954880,
 876046954673290438080,43416883192646088235008,
 2252711496770428822876800,
 124040138653975179571200000]

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Last modified May 2 07:19 EDT 2024. Contains 372178 sequences. (Running on oeis4.)