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A001820 formatted as a simple table:

n a(n)
0 1
1 14
2 273
3 7645
4 296296
5 15291640
6 1017067024
7 84865562640
8 8689315795776
9 1071814846360896
10 156823829909121024
11 26862299458337581056 

[1,14,273,7645,296296,15291640,1017067024,
 84865562640,8689315795776,1071814846360896,
 156823829909121024,26862299458337581056]

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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