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A038055 formatted as a simple table:

n a(n)
1 2
2 4
3 14
4 52
5 214
6 916
7 4116
8 18996
9 89894
10 433196
11 2119904
12 10503612
13 52594476
14 265713532
15 1352796790
16 6933598208
17 35747017596
18 185260197772
19 964585369012
20 5043220350012
21 26467146038744
22 139375369621960

[2,4,14,52,214,916,4116,18996,89894,433196,
 2119904,10503612,52594476,265713532,1352796790,
 6933598208,35747017596,185260197772,964585369012,
 5043220350012,26467146038744,139375369621960]

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Last modified December 5 17:24 EST 2009. Contains 170342 sequences.


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