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A074140 as a simple table

n a(n)
0 1
1 2
2 10
3 50
4 346
5 3182
6 38770
7 609290
8 11226106
9 250148582
10 7057182250
11 216512001950
12 7904093966626 

[1,2,10,50,346,3182,38770,609290,11226106,
 250148582,7057182250,216512001950,7904093966626]

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Last modified June 19 13:38 EDT 2013. Contains 226411 sequences.