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A000170 as a simple table

n a(n)
1 1
2 0
3 0
4 2
5 10
6 4
7 40
8 92
9 352
10 724
11 2680
12 14200
13 73712
14 365596
15 2279184
16 14772512
17 95815104
18 666090624
19 4968057848
20 39029188884
21 314666222712
22 2691008701644
23 24233937684440
24 227514171973736
25 2207893435808352
26 22317699616364044
27 234907967154122528

[1,0,0,2,10,4,40,92,352,724,2680,14200,73712,
 365596,2279184,14772512,95815104,666090624,
 4968057848,39029188884,314666222712,2691008701644,
 24233937684440,227514171973736,2207893435808352,
 22317699616364044,234907967154122528]

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Last modified August 20 01:30 EDT 2017. Contains 290821 sequences.