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A153957 as a simple table

n a(n)
0 1
1 2
2 4
3 16
4 56
5 256
6 1518
7 15896
8 171565
9 3217779
10 58858443
11 1927799742
12 63170771231
13 3671078892600
14 213376157401433
15 21677971544137049

[1,2,4,16,56,256,1518,15896,171565,3217779,
 58858443,1927799742,63170771231,3671078892600,
 213376157401433,21677971544137049]

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Last modified June 25 02:21 EDT 2024. Contains 373691 sequences. (Running on oeis4.)