n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 15 |
3 | 50 |
4 | 157 |
5 | 480 |
6 | 1451 |
7 | 4366 |
8 | 13113 |
9 | 39356 |
10 | 118087 |
11 | 354282 |
12 | 1062869 |
13 | 3188632 |
14 | 9565923 |
15 | 28697798 |
16 | 86093425 |
17 | 258280308 |
18 | 774840959 |
19 | 2324522914 |
20 | 6973568781 |
21 | 20920706384 |
22 | 62762119195 |
23 | 188286357630 |
24 | 564859072937 |
25 | 1694577218860 |
[1,4,15,50,157,480,1451,4366,13113,39356,118087, 354282,1062869,3188632,9565923,28697798,86093425, 258280308,774840959,2324522914,6973568781, 20920706384,62762119195,188286357630,564859072937, 1694577218860] |