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A054371 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 33
5 300
6 3412
7 40770
8 518043
9 6830545
10 92909684
11 1295151600
12 18426823044
13 266696759064
14 3916798516462
15 58253090490630
16 875948658280305
17 13299481192954961
18 203661940884670135
19 3142707632566279222
20 48829032430870168660
21 763383551090733489744

[1,1,1,4,33,300,3412,40770,518043,6830545,
 92909684,1295151600,18426823044,266696759064,
 3916798516462,58253090490630,875948658280305,
 13299481192954961,203661940884670135,
 3142707632566279222,48829032430870168660,
 763383551090733489744]

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Last modified March 29 15:16 EDT 2020. Contains 333107 sequences. (Running on oeis4.)