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A118279 formatted as a simple table:

n a(n)
3 0
4 -1
5 210
6 638
7 1348
8 -1
9 5282
10 7687
11 12453
12 -1
13 24813
14 -1
15 45338
16 -1
17 63702
18 84764
19 109613
20 -1
21 162687

[0,-1,210,638,1348,-1,5282,7687,12453,-1,24813,-1,
 45338,-1,63702,84764,109613,-1,162687]

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


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