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A056625 as a simple table

n a(n)
2 1
3 4
4 22
5 124
6 726
7 4352
8 26614
9 165204
10 1037672
11 6580424
12 42062040
13 270661328
14 1751614248
15 11391756176
16 74406502814
17 487838450116
18 3209229661682
19 21175301453040
20 140097533633112
21 929160187609096

[1,4,22,124,726,4352,26614,165204,1037672,6580424,
 42062040,270661328,1751614248,11391756176,
 74406502814,487838450116,3209229661682,
 21175301453040,140097533633112,929160187609096]

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Last modified October 21 15:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)