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A038392 as a simple table

n a(n)
1 1
2 1
3 2
4 6
5 19
6 71
7 274
8 1117
9 4650
10 19819
11 85710
12 375712
13 1664203
14 7439593
15 33515758
16 152019560
17 693625265
18 3181528275
19 14661581030
20 67850297506
21 315187646601
22 1469195636293
23 6869889703638
24 32215399021901
25 151467334017864
26 713881817440421
27 3372142139764434

[1,1,2,6,19,71,274,1117,4650,19819,85710,375712,
 1664203,7439593,33515758,152019560,693625265,
 3181528275,14661581030,67850297506,315187646601,
 1469195636293,6869889703638,32215399021901,
 151467334017864,713881817440421,3372142139764434]

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Last modified October 14 00:10 EDT 2019. Contains 327990 sequences. (Running on oeis4.)