n | a(n) |
---|---|
1 | 2 |
2 | 6 |
3 | 19 |
4 | 66 |
5 | 232 |
6 | 794 |
7 | 2574 |
8 | 7797 |
9 | 22058 |
10 | 58469 |
11 | 146027 |
12 | 345578 |
13 | 779240 |
14 | 1682359 |
15 | 3492869 |
16 | 6999952 |
17 | 13585959 |
18 | 25610002 |
19 | 47004982 |
20 | 84187248 |
21 | 147421139 |
22 | 252829908 |
23 | 425319569 |
24 | 702767285 |
25 | 1141951244 |
26 | 1826839569 |
27 | 2880058656 |
28 | 4478585700 |
[2,6,19,66,232,794,2574,7797,22058,58469,146027, 345578,779240,1682359,3492869,6999952,13585959, 25610002,47004982,84187248,147421139,252829908, 425319569,702767285,1141951244,1826839569, 2880058656,4478585700] |