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A170953 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 9
5 28
6 88
7 278
8 873
9 2743
10 8616
11 27067
12 85033
13 267138
14 839238
15 2636541
16 8282935
17 26021607
18 81749288
19 256822959
20 806833118
21 2534740993
22 7963123681
23 25016890852
24 78592880514
25 246906816045
26 775680639403
27 2436872598277
28 7655661052477
29 24050968520831

[0,0,1,3,9,28,88,278,873,2743,8616,27067,85033,
 267138,839238,2636541,8282935,26021607,81749288,
 256822959,806833118,2534740993,7963123681,
 25016890852,78592880514,246906816045,775680639403,
 2436872598277,7655661052477,24050968520831]

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Last modified July 28 11:06 EDT 2021. Contains 346326 sequences. (Running on oeis4.)