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A000844 as a simple table

n a(n)
1 4
2 19
3 556
4 2945786
5 1201330980739424
6 1846150007042109336331740689419264
7 44872306407070078313805671235110493948692333391216774983943586135973888

[4,19,556,2945786,1201330980739424,
 1846150007042109336331740689419264,
 44872306407070078313805671235110493948692333391216\
 774983943586135973888]

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Last modified August 6 00:46 EDT 2021. Contains 346493 sequences. (Running on oeis4.)