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A276852 as a simple table

n a(n)
0 0
1 1
2 2
3 7
4 28
5 121
6 560
7 2677
8 13230
9 66742
10 343092
11 1788681
12 9439870
13 50321865
14 270594896
15 1465941763
16 7993664588
17 43839212778
18 241650560756
19 1338084935826
20 7439615051328
21 41516113036777
22 232452845782308
23 1305500166481715
24 7352433083806020
25 41514430735834714

[0,1,2,7,28,121,560,2677,13230,66742,343092,
 1788681,9439870,50321865,270594896,1465941763,
 7993664588,43839212778,241650560756,1338084935826,
 7439615051328,41516113036777,232452845782308,
 1305500166481715,7352433083806020,
 41514430735834714]

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Last modified April 9 17:09 EDT 2020. Contains 333361 sequences. (Running on oeis4.)