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A086852 formatted as a simple table:

n a(n)
0 0
1 0
2 2
3 4
4 10
5 40
6 230
7 1580
8 12434
9 110320
10 1090270
11 11876980
12 141373610
13 1825321016
14 25405388150
15 379158271420
16 6039817462210
17 102278890975360
18 1834691141852174
19 34752142215026180
20 693126840194499290
21 14519428780464454600
22 318705819455462421670

[0,0,2,4,10,40,230,1580,12434,110320,1090270,
 11876980,141373610,1825321016,25405388150,
 379158271420,6039817462210,102278890975360,
 1834691141852174,34752142215026180,
 693126840194499290,14519428780464454600,
 318705819455462421670]

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


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