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A270631 as a simple table

n a(n)
0 1
1 5
2 20
3 60
4 312
5 1236
6 5132
7 20308
8 84836
9 348436
10 1422668
11 5780620
12 23307100
13 93611056
14 375155196
15 1502087240

[1,5,20,60,312,1236,5132,20308,84836,348436,
 1422668,5780620,23307100,93611056,375155196,
 1502087240]

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Last modified September 30 23:44 EDT 2020. Contains 337440 sequences. (Running on oeis4.)