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A226388 as a simple table

n a(n)
0 0
1 0
2 1
3 2
4 9
5 24
6 265
7 720
8 11025
9 62720
10 965601
11 3628800
12 130478425
13 479001600
14 19151042625
15 191132125184
16 4108830350625
17 20922789888000
18 1448301616386625
19 6402373705728000
20 466136852576275881
21 5675242696048640000
22 193688172394325870625

[0,0,1,2,9,24,265,720,11025,62720,965601,3628800,
 130478425,479001600,19151042625,191132125184,
 4108830350625,20922789888000,1448301616386625,
 6402373705728000,466136852576275881,
 5675242696048640000,193688172394325870625]

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Last modified August 9 14:27 EDT 2020. Contains 336323 sequences. (Running on oeis4.)