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A218898 as a simple table

n a(n)
1 4
2 6
3 18
4 34
5 86
6 180
7 426
8 930
9 2140
10 4758
11 10818
12 24240
13 54834
14 123274
15 278260
16 626446
17 1412746
18 3182416
19 7174106
20 16164834
21 36434260
22 82103270
23 185041218
24 417002816
25 939796802
26 2117936730
27 4773120596
28 10756848350
29 24242204506

[4,6,18,34,86,180,426,930,2140,4758,10818,24240,
 54834,123274,278260,626446,1412746,3182416,
 7174106,16164834,36434260,82103270,185041218,
 417002816,939796802,2117936730,4773120596,
 10756848350,24242204506]

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Last modified August 5 18:22 EDT 2021. Contains 346488 sequences. (Running on oeis4.)