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A247402 as a simple table

n a(n)
1 5640
2 19080
3 65500
4 225488
5 775668
6 2663568
7 9228900
8 32131008
9 111936140
10 389317160
11 1351717272
12 4699161664
13 16360262388
14 56987348980
15 198415286124
16 690350350384
17 2402167105696
18 8362231644240
19 29117543438860
20 101381411330896

[5640,19080,65500,225488,775668,2663568,9228900,
 32131008,111936140,389317160,1351717272,
 4699161664,16360262388,56987348980,198415286124,
 690350350384,2402167105696,8362231644240,
 29117543438860,101381411330896]

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)