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A002772 as a simple table

n a(n)
2 2
3 6
4 22
5 101
6 546
7 3502
8 25586
9 214062
10 1987516
11 20599076
12 232482372
13 2876191276
14 38228128472
15 549706132536
16 8408517839416
17 137788390312712
18 2383879842920976
19 43846851982943152
20 846470648320690736
21 17266870434276713616
22 367937854493289655072

[2,6,22,101,546,3502,25586,214062,1987516,
 20599076,232482372,2876191276,38228128472,
 549706132536,8408517839416,137788390312712,
 2383879842920976,43846851982943152,
 846470648320690736,17266870434276713616,
 367937854493289655072]

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Last modified February 17 15:19 EST 2019. Contains 320220 sequences. (Running on oeis4.)