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A047118 as a simple table

n a(n)
0 1
1 4
2 14
3 53
4 195
5 711
6 2662
7 9973
8 37367
9 141472
10 537422
11 2045224
12 7821958
13 30001955
14 115296650
15 444336395
16 1716137440
17 6639137474
18 25732460158
19 99897347527
20 388339939659
21 1511670332538
22 5891647475819
23 22987227251180

[1,4,14,53,195,711,2662,9973,37367,141472,537422,
 2045224,7821958,30001955,115296650,444336395,
 1716137440,6639137474,25732460158,99897347527,
 388339939659,1511670332538,5891647475819,
 22987227251180]

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Last modified December 2 18:41 EST 2021. Contains 349445 sequences. (Running on oeis4.)