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A027977 as a simple table

n a(n)
0 1
1 3
2 4
3 8
4 15
5 28
6 54
7 101
8 199
9 373
10 743
11 1404
12 2801
13 5353
14 10636
15 20495
16 40615
17 78753
18 155793
19 303553
20 599801
21 1173183
22 2316317
23 4544731
24 8968421
25 17641499
26 34801731
27 68602923
28 135308317
29 267203186
30 526966454
31 1042217402

[1,3,4,8,15,28,54,101,199,373,743,1404,2801,5353,
 10636,20495,40615,78753,155793,303553,599801,
 1173183,2316317,4544731,8968421,17641499,34801731,
 68602923,135308317,267203186,526966454,1042217402]

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Last modified December 12 20:12 EST 2019. Contains 329961 sequences. (Running on oeis4.)