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A269500 as a simple table

n a(n)
0 0
1 55
2 6765
3 832040
4 102334155
5 12586269025
6 1548008755920
7 190392490709135
8 23416728348467685
9 2880067194370816120
10 354224848179261915075
11 43566776258854844738105
12 5358359254990966640871840
13 659034621587630041982498215
14 81055900096023504197206408605

[0,55,6765,832040,102334155,12586269025,
 1548008755920,190392490709135,23416728348467685,
 2880067194370816120,354224848179261915075,
 43566776258854844738105,5358359254990966640871840,
 659034621587630041982498215,
 81055900096023504197206408605]

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Last modified October 18 09:54 EDT 2018. Contains 316320 sequences. (Running on oeis4.)