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A118278 formatted as a simple table:

n a(n)
3 0
4 -1
5 33066
6 146858
7 273118
8 -1
9 1274522
10 2117145
11 3613278
12 -1
13 7250758
14 -1
15 12911636
16 -1
17 22655394
18 26801303
19 25049533
20 -1
21 56922533

[0,-1,33066,146858,273118,-1,1274522,2117145,
 3613278,-1,7250758,-1,12911636,-1,22655394,
 26801303,25049533,-1,56922533]

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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