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A046209 formatted as a simple table:

n a(n)
1 1
2 1
3 2
4 6
5 16
6 38
7 104
8 270
9 726
10 1960
11 5368
12 14736
13 40880
14 113828
15 318848
16 896670
17 2532160
18 7174050
19 20390552
20 58112088
21 166037248
22 475467916
23 1364393896
24 3922624800
25 11297181456
26 32588003000
27 94143178098
28 272342710380

[1,1,2,6,16,38,104,270,726,1960,5368,14736,40880,
 113828,318848,896670,2532160,7174050,20390552,
 58112088,166037248,475467916,1364393896,
 3922624800,11297181456,32588003000,94143178098,
 272342710380]

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


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