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A139262 as a simple table

n a(n)
0 0
1 0
2 1
3 8
4 47
5 244
6 1186
7 5536
8 25147
9 112028
10 491870
11 2135440
12 9188406
13 39249768
14 166656772
15 704069248
16 2961699667
17 12412521388
18 51854046982
19 216013684528
20 897632738722
21 3721813363288
22 15401045060572
23 63616796642368
24 262357557683422
25 1080387930269464
26 4443100381114156

[0,0,1,8,47,244,1186,5536,25147,112028,491870,
 2135440,9188406,39249768,166656772,704069248,
 2961699667,12412521388,51854046982,216013684528,
 897632738722,3721813363288,15401045060572,
 63616796642368,262357557683422,1080387930269464,
 4443100381114156]

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Last modified November 15 05:50 EST 2019. Contains 329144 sequences. (Running on oeis4.)