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A147925 formatted as a simple table:

n a(n)
1 1
2 2
3 6
4 24
5 74
6 312
7 1620
8 7876
9 44022
10 307314
11 2064562
12 15229866
13 132064084
14 1095500280
15 10006003984
16 104500649736 

[1,2,6,24,74,312,1620,7876,44022,307314,2064562,
 15229866,132064084,1095500280,10006003984,
 104500649736]

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

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