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A000847 as a simple table

n a(n)
1 4
2 20
3 264
4 80104
5 464655217384
6 4220043418839499735652372200
7 176673930781452287254786178869471177643231519559311590043612856 

[4,20,264,80104,464655217384,
 4220043418839499735652372200,
 17667393078145228725478617886947117764323151955931\
 1590043612856]

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Last modified April 20 00:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)