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A026723 as a simple table

n a(n)
0 1
1 3
2 8
3 20
4 49
5 117
6 280
7 656
8 1551
9 3597
10 8442
11 19460
12 45457
13 104387
14 243086
15 556842
16 1294027
17 2959369
18 6867428
19 15687806
20 36368875
21 83015759
22 192321728
23 438755532
24 1015963203
25 2316887259
26 5363009706
27 12226893148
28 28295070847

[1,3,8,20,49,117,280,656,1551,3597,8442,19460,
 45457,104387,243086,556842,1294027,2959369,
 6867428,15687806,36368875,83015759,192321728,
 438755532,1015963203,2316887259,5363009706,
 12226893148,28295070847]

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Last modified October 17 16:31 EDT 2019. Contains 328117 sequences. (Running on oeis4.)