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A001258 as a simple table

n a(n)
2 1
3 1
4 2
5 6
6 25
7 135
8 892
9 6937
10 61886
11 621956
12 6946471
13 85302935
14 1141820808
15 16540534553
16 257745010762
17 4298050731298
18 76356627952069
19 1439506369337319
20 28699241994332940
21 603229325513240569
22 13330768181611378558
23 308967866671489907656
24 7493481669479297191451
25 189793402599733802743015
26 5010686896406348299630712

[1,1,2,6,25,135,892,6937,61886,621956,6946471,
 85302935,1141820808,16540534553,257745010762,
 4298050731298,76356627952069,1439506369337319,
 28699241994332940,603229325513240569,
 13330768181611378558,308967866671489907656,
 7493481669479297191451,189793402599733802743015,
 5010686896406348299630712]

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Last modified April 23 05:59 EDT 2024. Contains 371906 sequences. (Running on oeis4.)