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A020133 formatted as a simple table:

n a(n)
0 1
1 1
2 2
3 3
4 11
5 51
6 288
7 1916
8 14685
9 127263
10 1230202
11 13122150
12 153091745
13 1939162101
14 26501882046
15 388694270001
16 6089543563341
17 101492392722343
18 1793032271428053
19 33469935733323642
20 658242069422031619

[1,1,2,3,11,51,288,1916,14685,127263,1230202,
 13122150,153091745,1939162101,26501882046,
 388694270001,6089543563341,101492392722343,
 1793032271428053,33469935733323642,
 658242069422031619]

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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