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A051240 formatted as a simple table:

n a(n)
1 1
2 1
3 1
4 2
5 6
6 156
7 7013320
8 29281354514767168
9 234431745534048922731115555415680
10 453456943706240925312368435237969462391555337386758635520 

[1,1,1,2,6,156,7013320,29281354514767168,
 234431745534048922731115555415680,
 453456943706240925312368435237969462391555337386758635520]

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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