A018116 - OEIS

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A018116 as a simple table

n	a(n)
0	1
1	3
2	5
3	11
4	24
5	54
6	118
7	261
8	576
9	1275
10	2822
11	6246
12	13824
13	30598
14	67724
15	149897
16	331776
17	734342
18	1625364
19	3597522
20	7962624
21	17624185
22	39008732
23	86340517
24	191102976
25	422980417
26	936209560
27	2072172385

[1,3,5,11,24,54,118,261,576,1275,2822,6246,13824, 30598,67724,149897,331776,734342,1625364,3597522, 7962624,17624185,39008732,86340517,191102976, 422980417,936209560,2072172385]