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A018015 as a simple table

n a(n)
0 1
1 2
2 5
3 14
4 33
5 81
6 196
7 472
8 1138
9 2744
10 6613
11 15939
12 38416
13 92588
14 223150
15 537824
16 1296232
17 3124104
18 7529536
19 18147252
20 43737461
21 105413504
22 254061541
23 612324458
24 1475789056
25 3556861576
26 8572542414
27 20661046784
28 49796062076
29 120015593799
30 289254654976

[1,2,5,14,33,81,196,472,1138,2744,6613,15939,
 38416,92588,223150,537824,1296232,3124104,7529536,
 18147252,43737461,105413504,254061541,612324458,
 1475789056,3556861576,8572542414,20661046784,
 49796062076,120015593799,289254654976]

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Last modified November 15 19:18 EST 2019. Contains 329149 sequences. (Running on oeis4.)