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A081980 as a simple table

n a(n)
1 1
2 8
3 311
4 40808
5 12185065
6 6287341056
7 4738802232119
8 5387114456064096
9 8850391860017878609
10 18339240151336533115830
11 44718225006409477834272143
12 173879507464360746581828003860 

[1,8,311,40808,12185065,6287341056,4738802232119,
 5387114456064096,8850391860017878609,
 18339240151336533115830,
 44718225006409477834272143,
 173879507464360746581828003860]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)