n | a(n) |
---|---|
1 | 3 |
2 | 9 |
3 | 20 |
4 | 71 |
5 | 227 |
6 | 664 |
7 | 2107 |
8 | 6675 |
9 | 20696 |
10 | 65029 |
11 | 205057 |
12 | 643930 |
13 | 2026105 |
14 | 6384135 |
15 | 20104382 |
16 | 63329883 |
17 | 199576691 |
18 | 628932096 |
19 | 1982100085 |
20 | 6247388117 |
21 | 19691746204 |
22 | 62069757373 |
23 | 195654894641 |
24 | 616749232724 |
25 | 1944155102539 |
26 | 6128552692107 |
[3,9,20,71,227,664,2107,6675,20696,65029,205057, 643930,2026105,6384135,20104382,63329883, 199576691,628932096,1982100085,6247388117, 19691746204,62069757373,195654894641,616749232724, 1944155102539,6128552692107] |