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A016255 as a simple table

n a(n)
0 1
1 20
2 297
3 3964
4 50369
5 624036
6 7625689
7 92469068
8 1116354417
9 13443332212
10 161649541001
11 1942101373212
12 23321364646945
13 279969412942148
14 3360424215557433
15 40330629408450796
16 484006324653740753

[1,20,297,3964,50369,624036,7625689,92469068,
 1116354417,13443332212,161649541001,1942101373212,
 23321364646945,279969412942148,3360424215557433,
 40330629408450796,484006324653740753]

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Last modified May 24 18:52 EDT 2013. Contains 225630 sequences.