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A081253 as a simple table

n a(n)
1 2
2 4
3 9
4 18
5 37
6 74
7 149
8 298
9 597
10 1194
11 2389
12 4778
13 9557
14 19114
15 38229
16 76458
17 152917
18 305834
19 611669
20 1223338
21 2446677
22 4893354
23 9786709
24 19573418
25 39146837
26 78293674
27 156587349
28 313174698
29 626349397
30 1252698794
31 2505397589

[2,4,9,18,37,74,149,298,597,1194,2389,4778,9557,
 19114,38229,76458,152917,305834,611669,1223338,
 2446677,4893354,9786709,19573418,39146837,
 78293674,156587349,313174698,626349397,1252698794,
 2505397589]

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Last modified November 15 13:56 EST 2019. Contains 329149 sequences. (Running on oeis4.)