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A216187 as a simple table

n a(n)
0 0
1 1
2 2
3 6
4 28
5 200
6 1926
7 22512
8 306104
9 4770432
10 84234250
11 1663735040
12 36320155092
13 867963393024
14 22535294920334
15 631718010255360
16 19016907901995376
17 611869203759792128
18 20954324710009221138
19 761015341362413371392
20 29214930870257449355660

[0,1,2,6,28,200,1926,22512,306104,4770432,
 84234250,1663735040,36320155092,867963393024,
 22535294920334,631718010255360,19016907901995376,
 611869203759792128,20954324710009221138,
 761015341362413371392,29214930870257449355660]

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Last modified May 8 23:08 EDT 2024. Contains 372341 sequences. (Running on oeis4.)