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A026580 as a simple table

n a(n)
0 1
1 2
2 5
3 12
4 30
5 75
6 189
7 478
8 1211
9 3076
10 7818
11 19901
12 50680
13 129179
14 329383
15 840336
16 2144540
17 5474889
18 13980493
19 35709394
20 91228015
21 233108456
22 595740568
23 1522725379
24 3892624055
25 9952119054
26 25446913766
27 65072487645

[1,2,5,12,30,75,189,478,1211,3076,7818,19901,
 50680,129179,329383,840336,2144540,5474889,
 13980493,35709394,91228015,233108456,595740568,
 1522725379,3892624055,9952119054,25446913766,
 65072487645]

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Last modified September 17 12:00 EDT 2021. Contains 347477 sequences. (Running on oeis4.)