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A267639 as a simple table

n a(n)
1 3
2 18
3 51
4 189
5 429
6 1353
7 2829
8 8427
9 16899
10 49443
11 96657
12 282717
13 542913
14 1601355
15 3032535
16 9058395
17 16953333
18 51380925
19 95168013
20 292791555
21 537249507
22 1677388467
23 3051796161
24 9662000493
25 17443801617
26 55944191787
27 100303228599

[3,18,51,189,429,1353,2829,8427,16899,49443,96657,
 282717,542913,1601355,3032535,9058395,16953333,
 51380925,95168013,292791555,537249507,1677388467,
 3051796161,9662000493,17443801617,55944191787,
 100303228599]

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Last modified July 4 12:18 EDT 2022. Contains 355075 sequences. (Running on oeis4.)