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A211463 as a simple table

n a(n)
1 20
2 80
3 304
4 1144
5 4232
6 15536
7 56616
8 205400
9 742608
10 2678752
11 9648024
12 34716712
13 124861664
14 449008336
15 1614830152
16 5809328408
17 20907961552
18 75287770240
19 271263934328
20 977981837448
21 3528166785472
22 12736459731632
23 46007299834152

[20,80,304,1144,4232,15536,56616,205400,742608,
 2678752,9648024,34716712,124861664,449008336,
 1614830152,5809328408,20907961552,75287770240,
 271263934328,977981837448,3528166785472,
 12736459731632,46007299834152]

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)