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A005056 as a simple table

n a(n)
0 1
1 4
2 12
3 34
4 96
5 274
6 792
7 2314
8 6816
9 20194
10 60072
11 179194
12 535536
13 1602514
14 4799352
15 14381674
16 43112256
17 129271234
18 387682632
19 1162785754
20 3487832976
21 10462450354
22 31385253912
23 94151567434
24 282446313696
25 847322163874
26 2541932937192
27 7625731702714

[1,4,12,34,96,274,792,2314,6816,20194,60072,
 179194,535536,1602514,4799352,14381674,43112256,
 129271234,387682632,1162785754,3487832976,
 10462450354,31385253912,94151567434,282446313696,
 847322163874,2541932937192,7625731702714]

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Last modified September 20 17:16 EDT 2020. Contains 337265 sequences. (Running on oeis4.)