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A048611 formatted as a simple table:

n a(n)
0 1
1 6
2 20
3 56
4 156
5 340
6 2444
7 4440
8 167000
9 55556
10 267444
11 333400
12 132687920
13 5555556
14 10731400
15 40938800
16 2682647040
17 333334000
18 555555555555555556
19 3334367856
20 11034444280
21 35595935980
22 5555555555555555555556

[1,6,20,56,156,340,2444,4440,167000,55556,267444,
 333400,132687920,5555556,10731400,40938800,
 2682647040,333334000,555555555555555556,
 3334367856,11034444280,35595935980,
 5555555555555555555556]

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.


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