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A207686 as a simple table

n a(n)
1 18
2 324
3 660
4 2032
5 4728
6 11994
7 29982
8 77141
9 193184
10 485658
11 1213580
12 3090430
13 7754424
14 19478100
15 49010084
16 123869662
17 311515934
18 782045058
19 1972950126
20 4972883946
21 12497401442
22 31449373036
23 79304725202
24 199577343966

[18,324,660,2032,4728,11994,29982,77141,193184,
 485658,1213580,3090430,7754424,19478100,49010084,
 123869662,311515934,782045058,1972950126,
 4972883946,12497401442,31449373036,79304725202,
 199577343966]

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Last modified May 29 21:40 EDT 2023. Contains 363042 sequences. (Running on oeis4.)