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A263375 as a simple table

n a(n)
1 2
2 4
3 11
4 31
5 89
6 253
7 748
8 2214
9 6615
10 19767
11 59217
12 177393
13 531930
14 1595052
15 4784427
16 14351103
17 43051113
18 129146733
19 387433620
20 1162281150
21 3486823767
22 10460412279
23 31381177761
24 94143356001
25 282429890802
26 847289140884

[2,4,11,31,89,253,748,2214,6615,19767,59217,
 177393,531930,1595052,4784427,14351103,43051113,
 129146733,387433620,1162281150,3486823767,
 10460412279,31381177761,94143356001,282429890802,
 847289140884]

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Last modified October 22 11:35 EDT 2021. Contains 348160 sequences. (Running on oeis4.)