A004662 - OEIS

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A004662 as a simple table

n	a(n)
0	1
1	3
2	11
3	33
4	121
5	363
6	1331
7	4213
8	14641
9	46343
10	163251
11	531773
12	2015761
13	6051723
14	22175571
15	66571153
16	244153501
17	754502703
18	2705710511
19	10521531733
20	31765015621
21	115737051263
22	351635174031

[1,3,11,33,121,363,1331,4213,14641,46343,163251, 531773,2015761,6051723,22175571,66571153, 244153501,754502703,2705710511,10521531733, 31765015621,115737051263,351635174031]