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A218779 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 53
6 156
7 491
8 1584
9 5286
10 17855
11 61405
12 214012
13 754731
14 2688307
15 9659023
16 34947356
17 127260566
18 465920651
19 1714294995
20 6335423798
21 23506865260
22 87534068725
23 327024845325
24 1225395355165
25 4604242172697
26 17343284212635
27 65480496260109
28 247755060623522

[1,2,6,16,53,156,491,1584,5286,17855,61405,214012,
 754731,2688307,9659023,34947356,127260566,
 465920651,1714294995,6335423798,23506865260,
 87534068725,327024845325,1225395355165,
 4604242172697,17343284212635,65480496260109,
 247755060623522]

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Last modified February 22 20:30 EST 2019. Contains 320404 sequences. (Running on oeis4.)