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A258626 as a simple table

n a(n)
1 3
2 12
3 45
4 130
5 331
6 834
7 2115
8 5726
9 16873
10 50003
11 142116
12 400694
13 1157686
14 3355089
15 9458656
16 26092189
17 72995360
18 213171551
19 647222852
20 1987679608
21 6016219942
22 17773719595
23 51564943489
24 148469880307
25 426108755766
26 1217647287273

[3,12,45,130,331,834,2115,5726,16873,50003,142116,
 400694,1157686,3355089,9458656,26092189,72995360,
 213171551,647222852,1987679608,6016219942,
 17773719595,51564943489,148469880307,426108755766,
 1217647287273]

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Last modified September 26 20:34 EDT 2021. Contains 347672 sequences. (Running on oeis4.)