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A289928 as a simple table

n a(n)
0 1
1 4
2 14
3 48
4 162
5 547
6 1842
7 6206
8 20906
9 70438
10 237326
11 799629
12 2694199
13 9077599
14 30585239
15 103051135
16 347211149
17 1169861760
18 3941626163
19 13280557904
20 44746308037
21 150764154490
22 507971076799
23 1711511703373
24 5766612400708
25 19429501132982
26 65464000013233

[1,4,14,48,162,547,1842,6206,20906,70438,237326,
 799629,2694199,9077599,30585239,103051135,
 347211149,1169861760,3941626163,13280557904,
 44746308037,150764154490,507971076799,
 1711511703373,5766612400708,19429501132982,
 65464000013233]

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Last modified March 25 20:38 EDT 2019. Contains 321477 sequences. (Running on oeis4.)