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A140325 formatted as a simple table:

n a(n)
0 1
1 18
2 180
3 1320
4 7920
5 41184
6 192192
7 823680
8 3294720
9 12446720
10 44808192
11 154791936
12 515973120
13 1666990080
14 5239111680
15 16066609152
16 48199827456
17 141764198400
18 409541017600
19 1163958681600
20 3259084308480
21 9001280471040

[1,18,180,1320,7920,41184,192192,823680,3294720,
 12446720,44808192,154791936,515973120,1666990080,
 5239111680,16066609152,48199827456,141764198400,
 409541017600,1163958681600,3259084308480,
 9001280471040]

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


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