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A189771 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 1
7 2
8 7
9 20
10 76
11 334
12 2498
13 36398
14 1225629
15 89060804
16 12978995815
17 3646305137905
18 1947685504386516
19 1969840087225045340
20 3770491704215436784514
21 13674048211165798257589446
22 94122727377410134768239226418

[0,0,0,0,0,1,2,7,20,76,334,2498,36398,1225629,
 89060804,12978995815,3646305137905,
 1947685504386516,1969840087225045340,
 3770491704215436784514,13674048211165798257589446,
 94122727377410134768239226418]

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Last modified April 20 03:59 EDT 2024. Contains 371798 sequences. (Running on oeis4.)