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A011821 as a simple table

n a(n)
1 2
2 7
3 64
4 877
5 10742
6 102050
7 753994
8 4486435
9 22285884
10 95264798
11 359074648
12 1216716022
13 3763991016
14 10763615106
15 28741372964
16 72261453121
17 172248589406
18 391536067037
19 852876877928
20 1787799809335
21 3619382778994

[2,7,64,877,10742,102050,753994,4486435,22285884,
 95264798,359074648,1216716022,3763991016,
 10763615106,28741372964,72261453121,172248589406,
 391536067037,852876877928,1787799809335,
 3619382778994]

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Last modified May 22 00:16 EDT 2013. Contains 225508 sequences.