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A020051 as a simple table

n a(n)
0 1
1 0
2 1
3 4
4 16
5 77
6 448
7 3059
8 23919
9 210929
10 2070940
11 22403814
12 264772349
13 3393900115
14 46897528866
15 694936109571
16 10992625733214
17 184875978240420
18 3294153794102034
19 61989985034465559
20 1228528794319408360

[1,0,1,4,16,77,448,3059,23919,210929,2070940,
 22403814,264772349,3393900115,46897528866,
 694936109571,10992625733214,184875978240420,
 3294153794102034,61989985034465559,
 1228528794319408360]

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Last modified April 25 10:47 EDT 2024. Contains 371967 sequences. (Running on oeis4.)