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A047047 as a simple table

n a(n)
0 1
1 3
2 9
3 28
4 90
5 311
6 1099
7 3928
8 14151
9 52025
10 193192
11 721507
12 2704857
13 10219356
14 38814183
15 147936398
16 565229232
17 2167575626
18 8337587694
19 32144302453
20 124143606307
21 480449680735
22 1862906012700
23 7234641087486
24 28131953989641

[1,3,9,28,90,311,1099,3928,14151,52025,193192,
 721507,2704857,10219356,38814183,147936398,
 565229232,2167575626,8337587694,32144302453,
 124143606307,480449680735,1862906012700,
 7234641087486,28131953989641]

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Last modified April 24 02:46 EDT 2024. Contains 371917 sequences. (Running on oeis4.)