A178035 - OEIS

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A178035 as a simple table

n	a(n)
0	1
1	3
2	7
3	18
4	44
5	110
6	273
7	679
8	1687
9	4191
10	10406
11	25830
12	64097
13	159015
14	394391
15	977939
16	2424370
17	5977180
18	14756906

[1,3,7,18,44,110,273,679,1687,4191,10406,25830, 64097,159015,394391,977939,2424370,5977180, 14756906]