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A279972 as a simple table

n a(n)
1 0
2 9
3 50
4 296
5 1650
6 8666
7 43543
8 211650
9 1002602
10 4652327
11 21225237
12 95473540
13 424318824
14 1866436977
15 8136431834
16 35191126234
17 151149336828
18 645183934470
19 2738696392197
20 11567109056460
21 48632928912442
22 203627897130121

[0,9,50,296,1650,8666,43543,211650,1002602,
 4652327,21225237,95473540,424318824,1866436977,
 8136431834,35191126234,151149336828,645183934470,
 2738696392197,11567109056460,48632928912442,
 203627897130121]

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Last modified March 25 10:23 EDT 2019. Contains 321470 sequences. (Running on oeis4.)