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A005726 formatted as a simple table:

n a(n)
1 1
2 2
3 6
4 20
5 65
6 216
7 728
8 2472
9 8451
10 29050
11 100298
12 347568
13 1208220
14 4211312
15 14712960
16 51507280
17 180642391
18 634551606
19 2232223626
20 7862669700
21 27727507521
22 97884558992
23 345891702456
24 1223358393120
25 4330360551700

[1,2,6,20,65,216,728,2472,8451,29050,100298,
 347568,1208220,4211312,14712960,51507280,
 180642391,634551606,2232223626,7862669700,
 27727507521,97884558992,345891702456,
 1223358393120,4330360551700]

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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