n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 8 |
5 | 22 |
6 | 68 |
7 | 216 |
8 | 728 |
9 | 2513 |
10 | 8920 |
11 | 32116 |
12 | 117240 |
13 | 431550 |
14 | 1600734 |
15 | 5970704 |
16 | 22381184 |
17 | 84236890 |
18 | 318191804 |
19 | 1205692236 |
20 | 4581481776 |
21 | 17452915218 |
22 | 66637798834 |
23 | 254960616136 |
24 | 977346581800 |
25 | 3753005281872 |
[1,1,3,8,22,68,216,728,2513,8920,32116,117240, 431550,1600734,5970704,22381184,84236890, 318191804,1205692236,4581481776,17452915218, 66637798834,254960616136,977346581800, 3753005281872] |