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A318211 as a simple table

n a(n)
1 3
2 21
3 47
4 245
5 1042
6 4794
7 20502
8 93848
9 413543
10 1866198
11 8419364
12 37903931
13 171452530
14 772835587
15 3491017470
16 15756245294
17 71124997356
18 321138172302
19 1449613531826
20 6544951016378
21 29546522979051
22 133392926489825

[3,21,47,245,1042,4794,20502,93848,413543,1866198,
 8419364,37903931,171452530,772835587,3491017470,
 15756245294,71124997356,321138172302,
 1449613531826,6544951016378,29546522979051,
 133392926489825]

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Last modified May 17 12:43 EDT 2021. Contains 343971 sequences. (Running on oeis4.)