n | a(n) |
---|---|
0 | 4 |
1 | 13 |
2 | 45 |
3 | 152 |
4 | 491 |
5 | 1531 |
6 | 4652 |
7 | 13865 |
8 | 40713 |
9 | 118144 |
10 | 339559 |
11 | 968183 |
12 | 2742100 |
13 | 7721797 |
14 | 21637221 |
15 | 60367976 |
16 | 167787107 |
17 | 464776435 |
18 | 1283571068 |
19 | 3535240289 |
20 | 9713031489 |
21 | 26627195728 |
22 | 72847698655 |
23 | 198929987567 |
24 | 542305383076 |
25 | 1476061431421 |
[4,13,45,152,491,1531,4652,13865,40713,118144, 339559,968183,2742100,7721797,21637221,60367976, 167787107,464776435,1283571068,3535240289, 9713031489,26627195728,72847698655,198929987567, 542305383076,1476061431421] |