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A108704 formatted as a simple table:

n a(n)
0 1
1 1
2 4
3 18
4 126
5 1110
6 12120
7 156660
8 2341500
9 39701340
10 752839920
11 15785181720
12 362606123880
13 9055825538760
14 244296192460320
15 7079382509799600
16 219321853964413200
17 7233629128601475600
18 253054306933115688000

[1,1,4,18,126,1110,12120,156660,2341500,39701340,
 752839920,15785181720,362606123880,9055825538760,
 244296192460320,7079382509799600,
 219321853964413200,7233629128601475600,
 253054306933115688000]

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


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