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A147684 as a simple table

n a(n)
0 1
1 1
2 5
3 420
4 40350
5 19369350
6 9212531290
7 13126885205000
8 17810026933803520
9 55560479543584645500
10 164686892656273830526336
11 953018107457232657556038400

[1,1,5,420,40350,19369350,9212531290,
 13126885205000,17810026933803520,
 55560479543584645500,164686892656273830526336,
 953018107457232657556038400]

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Last modified February 16 05:05 EST 2019. Contains 320140 sequences. (Running on oeis4.)