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A230554 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 21
6 51
7 126
8 321
9 820
10 2160
11 5654
12 15272
13 40758
14 112280
15 304471
16 852164
17 2341980
18 6640755
19 18460066
20 52915999

[1,1,2,4,9,21,51,126,321,820,2160,5654,15272,
 40758,112280,304471,852164,2341980,6640755,
 18460066,52915999]

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Last modified June 20 15:30 EDT 2021. Contains 345165 sequences. (Running on oeis4.)