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A126905 formatted as a simple table:

n a(n)
0 1
1 20
2 210
3 1540
4 8855
5 42504
6 177100
7 657800
8 2220075
9 6906900
10 20030015
11 54627400
12 141121575
13 347381300
14 818853475
15 1856180040
16 4060814450
17 8600785600
18 17683732275
19 35379798300
20 69023414470
21 131555545100
22 245368274925
23 448512194200
24 804566566400

[1,20,210,1540,8855,42504,177100,657800,2220075,
 6906900,20030015,54627400,141121575,347381300,
 818853475,1856180040,4060814450,8600785600,
 17683732275,35379798300,69023414470,131555545100,
 245368274925,448512194200,804566566400]

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.


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