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A055990 as a simple table

n a(n)
1 1
2 4
3 14
4 50
5 181
6 657
7 2385
8 8657
9 31422
10 114051
11 413966
12 1502555
13 5453761
14 19795288
15 71850128
16 260791401
17 946583628
18 3435774958
19 12470688498
20 45264335853
21 164294064481
22 596331286321
23 2164478699633
24 7856317702310

[1,4,14,50,181,657,2385,8657,31422,114051,413966,
 1502555,5453761,19795288,71850128,260791401,
 946583628,3435774958,12470688498,45264335853,
 164294064481,596331286321,2164478699633,
 7856317702310]

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Last modified October 18 10:05 EDT 2019. Contains 328146 sequences. (Running on oeis4.)