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A213451 as a simple table

n a(n)
1 3
2 15
3 69
4 309
5 1365
6 5973
7 25941
8 112065
9 482067
10 2066583
11 8834469
12 37677603
13 160367343

[3,15,69,309,1365,5973,25941,112065,482067,
 2066583,8834469,37677603,160367343]

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Last modified September 25 12:38 EDT 2021. Contains 347654 sequences. (Running on oeis4.)