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A037681 as a simple table

n a(n)
1 1
2 4
3 19
4 78
5 313
6 1252
7 5011
8 20046
9 80185
10 320740
11 1282963
12 5131854
13 20527417
14 82109668
15 328438675
16 1313754702
17 5255018809
18 21020075236
19 84080300947
20 336321203790
21 1345284815161
22 5381139260644
23 21524557042579
24 86098228170318

[1,4,19,78,313,1252,5011,20046,80185,320740,
 1282963,5131854,20527417,82109668,328438675,
 1313754702,5255018809,21020075236,84080300947,
 336321203790,1345284815161,5381139260644,
 21524557042579,86098228170318]

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Last modified October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)