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A001266 as a simple table

n a(n)
2 0
3 0
4 1
5 7
6 45
7 323
8 2621
9 23811
10 239653
11 2648395
12 31889517
13 415641779
14 5830753109
15 87601592187
16 1403439027805
17 23883728565283
18 430284458893701
19 8181419271349931
20 163730286973255373
21 3440164703027845395
22 75718273707281368117
23 1742211593431076483419

[0,0,1,7,45,323,2621,23811,239653,2648395,
 31889517,415641779,5830753109,87601592187,
 1403439027805,23883728565283,430284458893701,
 8181419271349931,163730286973255373,
 3440164703027845395,75718273707281368117,
 1742211593431076483419]

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)