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A285868 as a simple table

n a(n)
0 1
1 1
2 4
3 20
4 126
5 962
6 8646
7 89546
8 1051350
9 13811642
10 200866326
11 3205348346
12 55704133590
13 1047489675962
14 21195507649686
15 459258707587706
16 10610386574074710
17 260385846630175802
18 6764666952807962646

[1,1,4,20,126,962,8646,89546,1051350,13811642,
 200866326,3205348346,55704133590,1047489675962,
 21195507649686,459258707587706,10610386574074710,
 260385846630175802,6764666952807962646]

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Last modified April 25 11:06 EDT 2024. Contains 371967 sequences. (Running on oeis4.)