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A301486 as a simple table

n a(n)
1 4
2 18
3 52
4 148
5 441
6 1372
7 4326
8 13641
9 42741
10 133208
11 414303
12 1289070
13 4015530
14 12519594
15 39044533
16 121754095
17 379591807
18 1183290025
19 3688511653
20 11498007929
21 35843459506
22 111739411177
23 348340800464
24 1085925223300
25 3385266114712

[4,18,52,148,441,1372,4326,13641,42741,133208,
 414303,1289070,4015530,12519594,39044533,
 121754095,379591807,1183290025,3688511653,
 11498007929,35843459506,111739411177,348340800464,
 1085925223300,3385266114712]

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Last modified May 25 19:13 EDT 2019. Contains 323576 sequences. (Running on oeis4.)