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A089094 as a simple table

n a(n)
1 0
2 1
3 5
4 20
5 70
6 222
7 654
8 1817
9 4815
10 12265
11 30217
12 72344
13 168950
14 386050
15 865264
16 1906260
17 4135320
18 8846700
19 18687800
20 39023300
21 80630770
22 164990461
23 334599050
24 672958200
25 1343096325
26 2661417579
27 5238577803
28 10246976040
29 19926439195

[0,1,5,20,70,222,654,1817,4815,12265,30217,72344,
 168950,386050,865264,1906260,4135320,8846700,
 18687800,39023300,80630770,164990461,334599050,
 672958200,1343096325,2661417579,5238577803,
 10246976040,19926439195]

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Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)