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A001233 formatted as a simple table:

n a(n)
6 1
7 21
8 322
9 4536
10 63273
11 902055
12 13339535
13 206070150
14 3336118786
15 56663366760
16 1009672107080
17 18861567058880
18 369012649234384
19 7551527592063024 

[1,21,322,4536,63273,902055,13339535,206070150,
 3336118786,56663366760,1009672107080,
 18861567058880,369012649234384,7551527592063024]

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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