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A017948 as a simple table

n a(n)
0 1
1 4
2 14
3 53
4 196
5 734
6 2744
7 10268
8 38416
9 143740
10 537824
11 2012354
12 7529536
13 28172944
14 105413504
15 394421216
16 1475789056
17 5521897023
18 20661046784
19 77306558318
20 289254654976
21 1082291816450
22 4049565169664

[1,4,14,53,196,734,2744,10268,38416,143740,537824,
 2012354,7529536,28172944,105413504,394421216,
 1475789056,5521897023,20661046784,77306558318,
 289254654976,1082291816450,4049565169664]

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Last modified October 28 10:30 EDT 2021. Contains 348327 sequences. (Running on oeis4.)