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A001453 as a simple table

n a(n)
2 1
3 4
4 13
5 41
6 131
7 428
8 1429
9 4861
10 16795
11 58785
12 208011
13 742899
14 2674439
15 9694844
16 35357669
17 129644789
18 477638699
19 1767263189
20 6564120419
21 24466267019
22 91482563639
23 343059613649
24 1289904147323
25 4861946401451
26 18367353072151
27 69533550916003
28 263747951750359

[1,4,13,41,131,428,1429,4861,16795,58785,208011,
 742899,2674439,9694844,35357669,129644789,
 477638699,1767263189,6564120419,24466267019,
 91482563639,343059613649,1289904147323,
 4861946401451,18367353072151,69533550916003,
 263747951750359]

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Last modified October 19 15:49 EDT 2018. Contains 316365 sequences. (Running on oeis4.)