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A018807 as a simple table

n a(n)
0 1
1 4
2 79
3 3600
4 281571
5 32572756
6 5109144543
7 1027533353168
8 254977173389319
9 75925129079783308
10 26568150968269086211
11 10749154284380665611224
12 4963704194366362387891227
13 2588716234142991968960920692
14 1511548995678989691821551648635

[1,4,79,3600,281571,32572756,5109144543,
 1027533353168,254977173389319,75925129079783308,
 26568150968269086211,10749154284380665611224,
 4963704194366362387891227,
 2588716234142991968960920692,
 1511548995678989691821551648635]

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Last modified May 20 16:32 EDT 2013. Contains 225464 sequences.