A000871 - OEIS

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A000871 as a simple table

n	a(n)
1	5
2	35
3	2266
4	30564722
5	25624410747226866
6	78769066691994300606138801216143967
7	3829103480069980011752318836153049525544593512352968628868212239132475999

[5,35,2266,30564722,25624410747226866, 78769066691994300606138801216143967, 38291034800699800117523188361530495255445935123529\ 68628868212239132475999]