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A121703 as a simple table

n a(n)
1 1
2 2
3 4
4 8
5 20
6 48
7 132
8 344
9 996
10 2720
11 8132
12 22888
13 69941
14 201029
15 624077
16 1821359
17 5722885
18 16919312
19 53779406
20 159276786 

[1,2,4,8,20,48,132,344,996,2720,8132,22888,69941,
 201029,624077,1821359,5722885,16919312,53779406,
 159276786]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)