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A226057 as a simple table

n a(n)
1 1
2 2
3 21
4 504
5 21380
6 1405800
7 132139140
8 16801276800
9 2775758497344
10 577868994460800
11 147973478687496000
12 45703277816543424000
13 16753246307626306832640
14 7190163806348621417679360
15 3571395525388698501285792000

[1,2,21,504,21380,1405800,132139140,16801276800,
 2775758497344,577868994460800,147973478687496000,
 45703277816543424000,16753246307626306832640,
 7190163806348621417679360,
 3571395525388698501285792000]

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Last modified September 9 21:06 EDT 2024. Contains 375765 sequences. (Running on oeis4.)