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A207697 as a simple table

n a(n)
1 18
2 324
3 612
4 1156
5 4216
6 15376
7 50096
8 163216
9 578528
10 2050624
11 6804864
12 22581504
13 79225344
14 277955584
15 930264256
16 3113416804
17 10855054516
18 37846589764
19 127345247780
20 428488068100
21 1487399982580
22 5163174596644
23 17438992794736

[18,324,612,1156,4216,15376,50096,163216,578528,
 2050624,6804864,22581504,79225344,277955584,
 930264256,3113416804,10855054516,37846589764,
 127345247780,428488068100,1487399982580,
 5163174596644,17438992794736]

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Last modified October 20 01:07 EDT 2021. Contains 348099 sequences. (Running on oeis4.)