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A000258 as a simple table

n a(n)
0 1
1 1
2 3
3 12
4 60
5 358
6 2471
7 19302
8 167894
9 1606137
10 16733779
11 188378402
12 2276423485
13 29367807524
14 402577243425
15 5840190914957
16 89345001017415
17 1436904211547895
18 24227076487779802
19 427187837301557598
20 7859930038606521508
21 150601795280158255827

[1,1,3,12,60,358,2471,19302,167894,1606137,
 16733779,188378402,2276423485,29367807524,
 402577243425,5840190914957,89345001017415,
 1436904211547895,24227076487779802,
 427187837301557598,7859930038606521508,
 150601795280158255827]

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Last modified May 9 18:53 EDT 2024. Contains 372354 sequences. (Running on oeis4.)