n | a(n) |
---|---|
1 | 4 |
2 | 21 |
3 | 80 |
4 | 259 |
5 | 775 |
6 | 2223 |
7 | 6336 |
8 | 17796 |
9 | 48912 |
10 | 131828 |
11 | 350506 |
12 | 923197 |
13 | 2413779 |
14 | 6272766 |
15 | 16221462 |
16 | 41787691 |
17 | 107324054 |
18 | 274986699 |
19 | 703245913 |
20 | 1795790220 |
21 | 4580304063 |
22 | 11671650321 |
23 | 29720454413 |
[4,21,80,259,775,2223,6336,17796,48912,131828, 350506,923197,2413779,6272766,16221462,41787691, 107324054,274986699,703245913,1795790220, 4580304063,11671650321,29720454413] |