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A002770 as a simple table

n a(n)
2 -1
3 5
4 253
5 39299
6 13265939
7 8616924013
8 9833937781275
9 18382040180023477
10 53311001020080183933
11 229658082900486063068939
12 1418085582879166915943461879
13 12182969300667152908506740224429
14 141998788870155117956738989275999795 

[-1,5,253,39299,13265939,8616924013,9833937781275,
 18382040180023477,53311001020080183933,
 229658082900486063068939,
 1418085582879166915943461879,
 12182969300667152908506740224429,
 141998788870155117956738989275999795]

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Last modified July 17 02:40 EDT 2024. Contains 374360 sequences. (Running on oeis4.)