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A027307 as a simple table

n a(n)
0 1
1 2
2 10
3 66
4 498
5 4066
6 34970
7 312066
8 2862562
9 26824386
10 255680170
11 2471150402
12 24161357010
13 238552980386
14 2375085745978
15 23818652359682
16 240382621607874
17 2439561132029314
18 24881261270812490
19 254892699352950850

[1,2,10,66,498,4066,34970,312066,2862562,26824386,
 255680170,2471150402,24161357010,238552980386,
 2375085745978,23818652359682,240382621607874,
 2439561132029314,24881261270812490,
 254892699352950850]

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Last modified September 20 12:43 EDT 2019. Contains 327238 sequences. (Running on oeis4.)