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A304770 as a simple table

n a(n)
1 4
2 21
3 27
4 67
5 139
6 303
7 685
8 1511
9 3316
10 7349
11 16265
12 35899
13 79332
14 175408
15 387618
16 856555
17 1893162
18 4184055
19 9246710
20 20435743
21 45164387
22 99815208
23 220596189
24 487529334
25 1077464178
26 2381248108
27 5262677458
28 11630780579
29 25704601383

[4,21,27,67,139,303,685,1511,3316,7349,16265,
 35899,79332,175408,387618,856555,1893162,4184055,
 9246710,20435743,45164387,99815208,220596189,
 487529334,1077464178,2381248108,5262677458,
 11630780579,25704601383]

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Last modified December 3 20:52 EST 2022. Contains 358543 sequences. (Running on oeis4.)