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A089405 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 20
6 47
7 112
8 279
9 712
10 1868
11 5020
12 13792
13 38630
14 110105
15 318756
16 935817
17 2782424
18 8368484
19 25434314
20 78047606 

[1,1,2,4,9,20,47,112,279,712,1868,5020,13792,
 38630,110105,318756,935817,2782424,8368484,
 25434314,78047606]

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)