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A251252 as a simple table

n a(n)
1 18
2 56
3 150
4 446
5 1232
6 3602
7 10108
8 29272
9 82854
10 238640
11 678658
12 1948718
13 5556204
14 15926754
15 45474920
16 130227048
17 372121034
18 1065071288
19 3044724350
20 8711869630
21 24910552504
22 71264572098
23 203799138404
24 582977750488
25 1667293062110

[18,56,150,446,1232,3602,10108,29272,82854,238640,
 678658,1948718,5556204,15926754,45474920,
 130227048,372121034,1065071288,3044724350,
 8711869630,24910552504,71264572098,203799138404,
 582977750488,1667293062110]

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Last modified February 7 08:55 EST 2023. Contains 360115 sequences. (Running on oeis4.)