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A155069 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 22
5 90
6 394
7 1806
8 8558
9 41586
10 206098
11 1037718
12 5293446
13 27297738
14 142078746
15 745387038
16 3937603038
17 20927156706
18 111818026018
19 600318853926
20 3236724317174
21 17518619320890
22 95149655201962
23 518431875418926

[1,1,2,6,22,90,394,1806,8558,41586,206098,1037718,
 5293446,27297738,142078746,745387038,3937603038,
 20927156706,111818026018,600318853926,
 3236724317174,17518619320890,95149655201962,
 518431875418926]

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Last modified October 22 10:00 EDT 2014. Contains 248391 sequences.