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A018807 formatted as a simple table:

n a(n)
1 4
2 79
3 3600
4 281571
5 32572756
6 5109144543
7 1027533353168
8 254977173389319
9 75925129079783308
10 26568150968269086211
11 10749154284380665611224 

[4,79,3600,281571,32572756,5109144543,
 1027533353168,254977173389319,75925129079783308,
 26568150968269086211,10749154284380665611224]

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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