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A109319 as a simple table

n a(n)
0 1
1 2
2 5
3 15
4 55
5 235
6 1119
7 5775
8 31663
9 182087
10 1087927
11 6706823
12 42433735
13 274403575
14 1807700679
15 12099813111
16 82113733447
17 563992581079
18 3914861387495
19 27429176467703
20 193781828188615
21 1379223584026967

[1,2,5,15,55,235,1119,5775,31663,182087,1087927,
 6706823,42433735,274403575,1807700679,12099813111,
 82113733447,563992581079,3914861387495,
 27429176467703,193781828188615,1379223584026967]

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