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A289987 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 12
5 146
6 5847
7 716141
8 300635753
9 430472002801
10 2117649544384420
11 36154420408979339192
12 2165755991529764630384554
13 459803603042851200545393118005 

[0,1,1,2,12,146,5847,716141,300635753,
 430472002801,2117649544384420,
 36154420408979339192,2165755991529764630384554,
 459803603042851200545393118005]

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Last modified May 17 16:19 EDT 2024. Contains 372603 sequences. (Running on oeis4.)