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A048987 formatted as a simple table:

n a(n)
0 1
1 20
2 400
3 8902
4 197281
5 4865609
6 119060324
7 3195901860
8 84998978956
9 2439530234167
10 69352859712417
11 2097651003696806 

[1,20,400,8902,197281,4865609,119060324,
 3195901860,84998978956,2439530234167,
 69352859712417,2097651003696806]

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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