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A008506 formatted as a simple table:

n a(n)
0 1
1 14
2 105
3 560
4 2380
5 8568
6 27132
7 77520
8 203490
9 497420
10 1144066
11 2496144
12 5200300
13 10400599
14 20058286
15 37442055
16 67863355
17 119757470
18 206244507
19 347346468
20 573088920
21 927780270
22 1475840380

[1,14,105,560,2380,8568,27132,77520,203490,497420,
 1144066,2496144,5200300,10400599,20058286,
 37442055,67863355,119757470,206244507,347346468,
 573088920,927780270,1475840380]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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