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A320986 as a simple table

n a(n)
0 0
1 1
2 4
3 17
4 276
5 17681
6 18105620
7 1186569930001
8 79629360058944734484
9 350213629188686097286494407640337
10 103364819020299355365011185381334444307580296786887956

[0,1,4,17,276,17681,18105620,1186569930001,
 79629360058944734484,
 350213629188686097286494407640337,
 10336481902029935536501118538133444430758029678688\
 7956]

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Last modified August 11 12:12 EDT 2022. Contains 356065 sequences. (Running on oeis4.)