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A263762 as a simple table

n a(n)
1 0
2 0
3 1
4 4
5 31
6 146
7 1289
8 6152
9 41747
10 181272
11 1029204
12 4541726
13 24695797
14 116559212
15 642871583
16 3152492440
17 17219444286
18 85580720364
19 459088917466
20 2296809945900
21 12164522824153
22 61405250721512
23 323474064711527

[0,0,1,4,31,146,1289,6152,41747,181272,1029204,
 4541726,24695797,116559212,642871583,3152492440,
 17219444286,85580720364,459088917466,
 2296809945900,12164522824153,61405250721512,
 323474064711527]

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Last modified November 14 22:45 EST 2019. Contains 329135 sequences. (Running on oeis4.)