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A052872 as a simple table

n a(n)
0 1
1 1
2 3
3 9
4 32
5 117
6 460
7 1850
8 7680
9 32467
10 139631
11 608280
12 2679881
13 11916492
14 53417407
15 241118245
16 1095030281
17 4999847240
18 22938576846
19 105690791104
20 488860041249 

[1,1,3,9,32,117,460,1850,7680,32467,139631,608280,
 2679881,11916492,53417407,241118245,1095030281,
 4999847240,22938576846,105690791104,488860041249]

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Last modified May 21 06:39 EDT 2013. Contains 225476 sequences.