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A269708 as a simple table

n a(n)
0 1
1 5
2 20
3 76
4 292
5 1132
6 4420
7 17356
8 68452
9 270892
10 1074820
11 4273036
12 17013412
13 67817452
14 270561220
15 1080119116 

[1,5,20,76,292,1132,4420,17356,68452,270892,
 1074820,4273036,17013412,67817452,270561220,
 1080119116]

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Last modified August 17 12:14 EDT 2024. Contains 375209 sequences. (Running on oeis4.)