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A000243 as a simple table

n a(n)
2 1
3 3
4 9
5 26
6 75
7 214
8 612
9 1747
10 4995
11 14294
12 40967
13 117560
14 337830
15 972027
16 2800210
17 8075889
18 23315775
19 67380458
20 194901273
21 564239262
22 1634763697
23 4739866803
24 13752309730
25 39926751310
26 115988095896
27 337138003197

[1,3,9,26,75,214,612,1747,4995,14294,40967,117560,
 337830,972027,2800210,8075889,23315775,67380458,
 194901273,564239262,1634763697,4739866803,
 13752309730,39926751310,115988095896,337138003197]

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Last modified November 13 17:34 EST 2019. Contains 329106 sequences. (Running on oeis4.)