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A140766 formatted as a simple table:

n a(n)
1 1
2 5
3 24
4 114
5 540
6 2556
7 12096
8 57240
9 270864
10 1281744
11 6065280
12 28701216
13 135815616
14 642686400
15 3041224704
16 14391229824
17 68100030720
18 322252805376
19 1524916647936
20 7215983055360

[1,5,24,114,540,2556,12096,57240,270864,1281744,
 6065280,28701216,135815616,642686400,3041224704,
 14391229824,68100030720,322252805376,
 1524916647936,7215983055360]

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


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