n | a(n) |
---|---|
1 | 2 |
2 | 7 |
3 | 21 |
4 | 65 |
5 | 196 |
6 | 588 |
7 | 1766 |
8 | 5299 |
9 | 15897 |
10 | 47693 |
11 | 143080 |
12 | 429240 |
13 | 1287722 |
14 | 3863167 |
15 | 11589501 |
16 | 34768505 |
17 | 104305516 |
18 | 312916548 |
19 | 938749646 |
20 | 2816248939 |
21 | 8448746817 |
22 | 25346240453 |
23 | 76038721360 |
24 | 228116164080 |
25 | 684348492242 |
[2,7,21,65,196,588,1766,5299,15897,47693,143080, 429240,1287722,3863167,11589501,34768505, 104305516,312916548,938749646,2816248939, 8448746817,25346240453,76038721360,228116164080, 684348492242] |