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A005284 as a simple table

n a(n)
6 1
7 6
8 27
9 111
10 440
11 1717
12 6655
13 25728
14 99412
15 384320
16 1487262
17 5762643
18 22357907
19 86859412
20 337879565
21 1315952428
22 5131231668
23 20029728894
24 78265410550
25 306109412100
26 1198306570554
27 4694809541046
28 18407850118383

[1,6,27,111,440,1717,6655,25728,99412,384320,
 1487262,5762643,22357907,86859412,337879565,
 1315952428,5131231668,20029728894,78265410550,
 306109412100,1198306570554,4694809541046,
 18407850118383]

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Last modified February 22 05:49 EST 2019. Contains 320385 sequences. (Running on oeis4.)