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A000167 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 2
5 9
6 49
7 306
8 2188
9 17810
10 162482
11 1642635
12 18231462
13 220420179
14 2883693795
15 40592133316
16 611765693528
17 9828843229764
18 167702100599524
19 3028466654021205
20 57708568527002410
21 1157199837194069405

[0,0,0,1,2,9,49,306,2188,17810,162482,1642635,
 18231462,220420179,2883693795,40592133316,
 611765693528,9828843229764,167702100599524,
 3028466654021205,57708568527002410,
 1157199837194069405]

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Last modified December 20 17:47 EST 2014. Contains 252272 sequences.