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A305012 as a simple table

n a(n)
1 3
2 51
3 99
4 255
5 2715
6 9499
7 30457
8 225009
9 1046863
10 4428355
11 25786862
12 133489800
13 644632918
14 3500846702
15 18523401621
16 94736004178
17 504816486286
18 2678501833047
19 14004203659303
20 74284132555049
21 393952194673461
22 2076786525949422

[3,51,99,255,2715,9499,30457,225009,1046863,
 4428355,25786862,133489800,644632918,3500846702,
 18523401621,94736004178,504816486286,
 2678501833047,14004203659303,74284132555049,
 393952194673461,2076786525949422]

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Last modified September 20 07:32 EDT 2021. Contains 347577 sequences. (Running on oeis4.)