A041015 - OEIS

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A041015 as a simple table

n	a(n)
0	1
1	3
2	19
3	60
4	379
5	1197
6	7561
7	23880
8	150841
9	476403
10	3009259
11	9504180
12	60034339
13	189607197
14	1197677521
15	3782639760
16	23893516081
17	75463188003
18	476672644099
19	1505481120300
20	9509559365899
21	30034159217997

[1,3,19,60,379,1197,7561,23880,150841,476403, 3009259,9504180,60034339,189607197,1197677521, 3782639760,23893516081,75463188003,476672644099, 1505481120300,9509559365899,30034159217997]