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A000881 as a simple table

n a(n)
1 4
2 15
3 276
4 5534533
5 1473914807822315239
6 28960574959925842749932484608400325311784104
7 11182854043812984653151849586832952714557996202582672732591909323787317314909793862964567968430394 

[4,15,276,5534533,1473914807822315239,
 28960574959925842749932484608400325311784104,
 11182854043812984653151849586832952714557996202582\
 672732591909323787317314909793862964567968430394]

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Last modified April 25 13:41 EDT 2024. Contains 371970 sequences. (Running on oeis4.)