A030893 - OEIS

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A030893 as a simple table

n	a(n)
1	1
2	3
3	9
4	36
5	181
6	1086
7	7607
8	60862
9	547759
10	5477598
11	60253580
12	723042962
13	9399558518
14	131593819259
15	1973907288891
16	31582516622266
17	536902782578529
18	9664250086413531
19	183620751641857104
20	3672415032837142098

[1,3,9,36,181,1086,7607,60862,547759,5477598, 60253580,723042962,9399558518,131593819259, 1973907288891,31582516622266,536902782578529, 9664250086413531,183620751641857104, 3672415032837142098]