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A131385 formatted as a simple table:

n a(n)
1 1
2 2
3 6
4 16
5 60
6 144
7 672
8 1536
9 6480
10 19200
11 76032
12 165888
13 1048320
14 2257920
15 8294400
16 28311552
17 126904320
18 268738560
19 1470873600
20 3096576000
21 16094453760
22 51385466880
23 175814737920
24 366917713920
25 2717245440000

[1,2,6,16,60,144,672,1536,6480,19200,76032,165888,
 1048320,2257920,8294400,28311552,126904320,
 268738560,1470873600,3096576000,16094453760,
 51385466880,175814737920,366917713920,
 2717245440000]

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.


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