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A098581 as a simple table

n a(n)
0 1
1 3
2 7
3 7
4 15
5 39
6 95
7 151
8 271
9 583
10 1343
11 2551
12 4719
13 9383
14 20127
15 40535
16 78287
17 153351
18 314367
19 638647
20 1264943
21 2491751
22 5006687
23 10115863
24 20235407
25 40169415
26 80222911
27 161149815
28 323033071
29 644388391
30 1286171679
31 2575370199

[1,3,7,7,15,39,95,151,271,583,1343,2551,4719,9383,
 20127,40535,78287,153351,314367,638647,1264943,
 2491751,5006687,10115863,20235407,40169415,
 80222911,161149815,323033071,644388391,1286171679,
 2575370199]

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Last modified April 6 09:00 EDT 2020. Contains 333268 sequences. (Running on oeis4.)