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A026951 formatted as a simple table:

n a(n)
0 1
1 2
2 6
3 34
4 116
5 678
6 2438
7 14494
8 53538
9 321590
10 1207186
11 7301142
12 27702096
13 168359754
14 643682106
15 3926147730
16 15096518580
17 92338836390
18 356629256930

[1,2,6,34,116,678,2438,14494,53538,321590,1207186,
 7301142,27702096,168359754,643682106,3926147730,
 15096518580,92338836390,356629256930]

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.


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