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A231747 as a simple table

n a(n)
1 3
2 15
3 51
4 186
5 687
6 2485
7 9068
8 33308
9 121445
10 444183
11 1626731
12 5949198
13 21774916
14 79713938
15 291767058
16 1068145321
17 3910543065
18 14316731138
19 52417430039
20 191916565888
21 702674552025
22 2572785049162
23 9420099176524
24 34491356066515

[3,15,51,186,687,2485,9068,33308,121445,444183,
 1626731,5949198,21774916,79713938,291767058,
 1068145321,3910543065,14316731138,52417430039,
 191916565888,702674552025,2572785049162,
 9420099176524,34491356066515]

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Last modified October 21 21:11 EDT 2021. Contains 348155 sequences. (Running on oeis4.)