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A001542 formatted as a simple table:

n a(n)
0 0
1 2
2 12
3 70
4 408
5 2378
6 13860
7 80782
8 470832
9 2744210
10 15994428
11 93222358
12 543339720
13 3166815962
14 18457556052
15 107578520350
16 627013566048
17 3654502875938
18 21300003689580
19 124145519261542
20 723573111879672

[0,2,12,70,408,2378,13860,80782,470832,2744210,
 15994428,93222358,543339720,3166815962,
 18457556052,107578520350,627013566048,
 3654502875938,21300003689580,124145519261542,
 723573111879672]

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.


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