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A006494 as a simple table

n a(n)
0 1
1 20
2 400
3 8902
4 197281
5 4865617
6 119060679
7 3195913043
8 84999425906
9 2439540533153
10 69353270203366
11 2097660204806910
12 62855340727822758
13 1981075507583376209

[1,20,400,8902,197281,4865617,119060679,
 3195913043,84999425906,2439540533153,
 69353270203366,2097660204806910,62855340727822758,
 1981075507583376209]

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Last modified October 23 05:42 EDT 2018. Contains 316519 sequences. (Running on oeis4.)