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A127298 formatted as a simple table:

n a(n)
0 1
1 1
2 2
3 5
4 30
5 504
6 1978
7 714840
8 500421564
9 4855562127780
10 1169461626163992
11 112848995546998874467920
12 7363180440 

[1,1,2,5,30,504,1978,714840,500421564,
 4855562127780,1169461626163992,
 112848995546998874467920,7363180440]

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

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