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A001759 as a simple table

n a(n)
4 2
5 28
6 236
7 1852
8 14622
9 119964
10 1034992
11 9434444
12 90968602
13 927367340
14 9982234068
15 113261721276
16 1352111669942
17 16950982295356
18 222752212005464
19 3062768908594348
20 43987314357078642
21 658804420084315212

[2,28,236,1852,14622,119964,1034992,9434444,
 90968602,927367340,9982234068,113261721276,
 1352111669942,16950982295356,222752212005464,
 3062768908594348,43987314357078642,
 658804420084315212]

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Last modified November 15 09:36 EST 2018. Contains 317232 sequences. (Running on oeis4.)