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A032313 as a simple table

n a(n)
1 2
2 3
3 7
4 21
5 41
6 178
7 743
8 1893
9 7141
10 40686
11 242045
12 734858
13 3426541
14 16135967
15 125737204
16 1002664205
17 3666743533
18 19447711462
19 106460517281
20 670516591350
21 6612951841507
22 70889373855917

[2,3,7,21,41,178,743,1893,7141,40686,242045,
 734858,3426541,16135967,125737204,1002664205,
 3666743533,19447711462,106460517281,670516591350,
 6612951841507,70889373855917]

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Last modified November 28 08:29 EST 2014. Contains 250285 sequences.