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A304693 as a simple table

n a(n)
1 2
2 45
3 178
4 918
5 4910
6 24408
7 124399
8 641663
9 3271834
10 16747810
11 85795064
12 438971334
13 2247194765
14 11504929439
15 58893248470
16 301494626010
17 1543466274885
18 7901476939284
19 40450502258451
20 207080879283742
21 1060121076327341

[2,45,178,918,4910,24408,124399,641663,3271834,
 16747810,85795064,438971334,2247194765,
 11504929439,58893248470,301494626010,
 1543466274885,7901476939284,40450502258451,
 207080879283742,1060121076327341]

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Last modified September 28 04:51 EDT 2021. Contains 347703 sequences. (Running on oeis4.)