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A048731 as a simple table

n a(n)
0 1
1 1
2 4
3 15
4 256
5 1285
6 5440
7 28123
8 16777216
9 150994953
10 1140868096
11 12465661415
12 73299656704
13 952678341901
14 5584872095744
15 56294136361779
16 18446744073709551616
17 313594649253062377489
18 4796153459164500459520
19 91477403861525991461727
20 1213648186380073308258304

[1,1,4,15,256,1285,5440,28123,16777216,150994953,
 1140868096,12465661415,73299656704,952678341901,
 5584872095744,56294136361779,18446744073709551616,
 313594649253062377489,4796153459164500459520,
 91477403861525991461727,1213648186380073308258304]

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Last modified June 12 10:07 EDT 2024. Contains 373329 sequences. (Running on oeis4.)