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A028471 as a simple table

n a(n)
0 1
1 55
2 6336
3 817991
4 108435745
5 14479521761
6 1937528668711
7 259423766712000
8 34741645659770711
9 4652799879944138561
10 623139489426439754945
11 83456125990631342400791
12 11177167872295392172767936
13 1496943834332592837945956455
14 200483802581126644843760725601

[1,55,6336,817991,108435745,14479521761,
 1937528668711,259423766712000,34741645659770711,
 4652799879944138561,623139489426439754945,
 83456125990631342400791,
 11177167872295392172767936,
 1496943834332592837945956455,
 200483802581126644843760725601]

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Last modified May 28 12:18 EDT 2020. Contains 334681 sequences. (Running on oeis4.)