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A305588 as a simple table

n a(n)
1 4
2 23
3 95
4 390
5 1626
6 6818
7 28530
8 119266
9 498890
10 2087148
11 8731184
12 36525814
13 152804412
14 639253506
15 2674304822
16 11187927898
17 46804640008
18 195807072344
19 819158586242
20 3426949449364
21 14336642689542
22 59977347549018

[4,23,95,390,1626,6818,28530,119266,498890,
 2087148,8731184,36525814,152804412,639253506,
 2674304822,11187927898,46804640008,195807072344,
 819158586242,3426949449364,14336642689542,
 59977347549018]

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Last modified May 17 11:11 EDT 2022. Contains 353745 sequences. (Running on oeis4.)