A136041 - OEIS

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A136041 as a simple table

n	a(n)
1	3
2	7
3	19
4	43
5	163
6	487
7	1459
8	3079
9	8803
10	39367
11	78787
12	196831
13	581743
14	2125819
15	6381667
16	19131877
17	86093443
18	258280327
19	516560659
20	1214874127

[3,7,19,43,163,487,1459,3079,8803,39367,78787, 196831,581743,2125819,6381667,19131877,86093443, 258280327,516560659,1214874127]